Having the right tools as a developer will save you a lot of time on everything. Whether it's to check data or validate commands and configurations, it quickly becomes essential.
You can think of any tools, languages, or frameworks used by developers, you will find the cheatsheet on this site. In a few clicks you have access to everything and it is easily printable.
It's useless since that's not what's important. The important thing is to remember the concepts, not the details. All possible languages, explained in one page, in almost all languages, via concrete code examples.
It differs greatly from the first one because here each language is explained as a course. It's a must to help the memory!
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