diff --git a/docs/arrays.md b/docs/arrays.md
index d512f22..7ead592 100644
--- a/docs/arrays.md
+++ b/docs/arrays.md
@@ -1,8 +1,8 @@
 # Arrays
 
-## Array methods
+## Built-in Array methods
 
-- `arr_len()` - returns the length of the array
+- `arr_len()` or `len(arr)` - returns the length of the array
 - `arr_push(array, item)` - adds an item to the end of the array
 - `arr_pop(array, index)` - removes an item from the end of the array
 - `arr_append(array, item)` - adds an item to the end of the array
@@ -34,7 +34,7 @@ print(arr_find(arr, 1)) # 2
 print(arr_slice(arr, 0, 5)) # [1, 2, 3, 4, 5]
 ```
 
-## Array operators (Development)
+## Array operators
 
 - `+` (concatenation)
 - `*` (repetition)
@@ -63,19 +63,17 @@ print(arr1 * 2) # [1, 2, 3, 1, 2, 3]
 - `is_array()` - returns `true` if the value is an array, otherwise `false`
 
 ```py linenums="1" title="array-standard-library.rn"
-include Array # Include the Array standard library
+import Array # Include the Array standard library
 
 # Create an array instance using the Array class
 arr = Array([1, 2, 3, 4, 5])
 
-print(arr.len()) # 5
+print(len(arr)) # 5
 print(arr.is_empty()) # false
 print(arr.to_string()) # "[1, 2, 3, 4, 5]"
 print(arr.is_array()) # true
 
-print(arr.map(fun (item) {
-    return str(item)
-})) # ["1", "2", "3", "4", "5"]
+print(arr.map(fun (item) -> str(item))) # ["1", "2", "3", "4", "5"]
 
 print(arr.append(6)) # [1, 2, 3, 4, 5, 6]
 print(arr.pop(5)) # [1, 2, 3, 4, 5]
diff --git a/docs/built-in-functions.md b/docs/built-in-functions.md
index 6799611..2a9b42d 100644
--- a/docs/built-in-functions.md
+++ b/docs/built-in-functions.md
@@ -14,7 +14,13 @@ They are:
 - `clear()` - clears the screen.
 - `exit()` - exits the program.
 
-### Same as include statement
+### Shell commands
+
+- `help(obj)` - get help about any object
+- `license()` - show project license
+- `credits()` - show project credits
+
+### Same as `import` statement
 
 - `require()` - same as include statement to include a file or
   library in the current program.
@@ -25,8 +31,8 @@ They are:
 
 ### API methods
 
-- `pyapi(string)` - A high-level Python API for Radon.
-  It is used to call Python functions from Radon. (Development)
+- `pyapi(string,ns)` - A high-level Python API for Radon.
+  It is used to call Python functions from Radon.
 
 ### Typecase methods
 
diff --git a/docs/classes.md b/docs/classes.md
index cf5e6e4..97b6fde 100644
--- a/docs/classes.md
+++ b/docs/classes.md
@@ -32,7 +32,7 @@ object by simply calling the class like as a function. It is followed by the
 name of the class and the arguments in parentheses. The arguments are optional.
 
 ```js linenums="1" title="objects.rn"
-person = Person();
+person = Person()
 ```
 
 ## Fields
@@ -77,16 +77,16 @@ the return type. The parameters and the return type are optional.
 
 ```py linenums="1" title="methods.rn"
 class Person {
-    fun Person(name, age) {
+    fun __constructor__(name, age) {
         this.name = name
         this.age = age
     }
 
-    fun sayHello() {
+    fun say_hello() {
         print("Hello, " + this.name + "!")
     }
 }
 
 person = Person("John", 20)
-person.sayHello() # Output: Hello, John!
+person.say_hello() # Output: Hello, John!
 ```
diff --git a/docs/data-types.md b/docs/data-types.md
index 07a8d19..61a3938 100644
--- a/docs/data-types.md
+++ b/docs/data-types.md
@@ -15,24 +15,21 @@ Arrays are declared using the `[]` syntax. The type of the array is the type
 of the elements it contains.
 
 ```js linenums="1" title="arrays.rn"
-a = [1, 2, 3]; // a is an array of ints
-b = [1.0, 2.0, 3.0]; // b is an array of floats
-c = ["a", "b", "c"]; // c is an array of strings
+a = [1, 2, 3] // a is an array of ints
+b = [1.0, 2.0, 3.0] // b is an array of floats
+c = ["a", "b", "c"] // c is an array of strings
 
 // Arrays can be nested
-d = [
-  [1, 2],
-  [3, 4],
-]; // d is an array of arrays of ints
+d = [[1, 2], [3, 4]] // d is an array of arrays of ints
 
 // Arrays can be empty
-e = []; // e is an empty array of unknown type
+e = [] // e is an empty array of unknown type
 ```
 
-## Objects (Development)
+## Hashmaps
 
-Objects are declared using the `{}` syntax. The type of the object is the
-type of the fields it contains.
+Hashmaps (or objects) are declared using the `{}` syntax.
+The type of the object is the type of the fields it contains.
 
 ```js linenums="1" title="objects.rn"
 // a is an object with fields x and y of type int
diff --git a/docs/exceptions.md b/docs/error-handling.md
similarity index 54%
rename from docs/exceptions.md
rename to docs/error-handling.md
index a1f3702..0565fe5 100644
--- a/docs/exceptions.md
+++ b/docs/error-handling.md
@@ -1,17 +1,18 @@
-# Exceptions
+# Error Handling
 
-Radon has a powerfull exception handler. It can handle exceptions and errors in
-the program. It can also throw exceptions and errors.
+Error handling is an important part of writing maintainable code.
+Radon has a powerful exception handler. It can handle exceptions that
+may occur during the execution of a block of code.
 
 ## Handling exceptions
 
-To handle exceptions, we use the `try` and `catch` blocks. The `try` block
+In Radon, `try-catch` blocks are used for error handling. The `try` block
 contains the code that may throw an exception. The `catch` block contains
 the code that handles the exception.
 
 ```js linenums="1" title="exceptions.rn"
 try {
-    // code that may throw an exception
+    // code that may throw an exception (in this case, zero division)
     a = 1 / 0
 } catch as err {
     // code that handles the exception
@@ -47,9 +48,9 @@ Exception caught
 
 ## Raise exceptions
 
-To raise an exception, we use the `raise` keyword followed by the exception
-type and the message. We have builtin exceptions in `radiation` module. We can
-use them to raise exceptions.
+In Radon, errors can be raised explicitly using the `raise` keyword. This is useful for enforcing certain conditions or for creating custom error messages.
+
+Radon has a standard `radiation` module for Error Types (you can type `radiation.errors` in the shell to view a list of available error types)
 
 ```js linenums="1" title="exceptions.rn"
 import radiation
@@ -71,6 +72,33 @@ ValueError: 2 + 2 != 4
 
 ```
 
+## Defining custom error types
+
+To define custom errors, you need to define a function that returns a string as the
+error message.
+
+## Example
+
+```js linenums="1" title="custom-error.rn"
+fun CustomError(file) {
+    return "Something went wrong in " + file
+}
+
+raise CustomError("custom-error.rn")
+```
+
+**Output:**
+
+```py
+Radiation (most recent call last):
+  File <stdin>, line 10
+FunctionError: Something went wrong in risky_operation
+
+    raise FunctionError("risky_operation")
+          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+```
+
 When the exception is raised, the program stops executing and the exception is
 propagated up the call stack. The exception can be caught by a `try` block. If
 the exception is not caught, the program stops executing and the exception
diff --git a/docs/modules.md b/docs/modules.md
index b1108b4..68b5dff 100644
--- a/docs/modules.md
+++ b/docs/modules.md
@@ -18,7 +18,7 @@ name should have to be in Pascal Case `PascalCase`.
 
 ```py linenums="1" title="Hello.rn"
 class Hello {
-    fun Hello() {
+    fun __constructor__() {
         print("Hello, World!")
     }
 }
@@ -30,5 +30,5 @@ A module is imported by using the `include` keyword. It is followed by the name
 of the module. The name of the module should have to be in Pascal Case `PascalCase`.
 
 ```py linenums="1" title="importing.rn"
-include Hello
+import Hello
 ```
diff --git a/docs/standard-library.md b/docs/standard-library.md
index 98d28c3..6582b1a 100644
--- a/docs/standard-library.md
+++ b/docs/standard-library.md
@@ -5,12 +5,14 @@
 ```text
 *
 ├── stdlib
-│   ├── Argparser.rn
-│   ├── Array.rn
-│   ├── Math.rn
-│   ├── String.rn
-│   ├── System.rn
-│   └── Winlib.rn
+│   ├── argparser.rn
+│   ├── array.rn
+│   ├── colorlib.rn
+│   ├── math.rn
+│   ├── radiation.rn
+│   ├── string.rn
+│   ├── system.rn
+│   └── winlib.rn
 ```
 
 ... and more to come! Under development.
diff --git a/mkdocs.yml b/mkdocs.yml
index 2cf3f75..fa7315a 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -112,7 +112,7 @@ nav:
       - Classes: classes.md
       - Modules: modules.md
       - Input/Output: input-output.md
-      - Exceptions: exceptions.md
+      - Error Handling: error-handling.md
       - File Handling: file-handling.md
       - Strings: strings.md
       - Arrays: arrays.md