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@NeutronStar Since nearly a year, I'd say. I started learning in August last year, but got reaally into it in October.
I wouldn't say I am a coder, though. Higher-level concepts are still a mystery to me. I just keep utilizing every new thing I learn, right away :)
Thanks for the nice words ;)
There is no perfect book. Search in App-/Play-Store for apps like algorithm, math, Networks, computer technologie etc. and never use only one book and/or app.
You can also look in Google books. There are also a lot of books and some are free. and If you searched for one thematik, you'll find a lot of webpages who will explain it from different sites.