sfml-blueprints is not a good book, reasons being the following
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a lot of the code is not explained, i am not saying "i need everything in front of me", but if you are using some construct in World class which should be introduced in Configuration, that should be explained or atleasted hinted as (do it yourself like that). reader assumes that the author might be going there in later pages but no, and slowly things pile up.
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inconsistent coding style, somewhere camel case is used, somewhere snake case, sometimes Allman style brace wrapping, sometimes linux style.
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non-incremental nature => you read 15 pages and you don't have anything to compile, ecs makes things worst, this patch is all boilerplate code and still it doesn't compile as the author left out big chunks, or started using constructs which were missing so code became uncompilable.
=> i won't say it was total time waste, sure my fingers got some exercise and my brain got some focus time, but for graphics programming, please avoid this book, it's not worth the time.