Don't bother with this stuff (or with "modern C") if you're just beginning to learn the language. You don't need it for small programs. No one is going to yell at you if your first effort isn't perfect. And no one is going to yell at you if you read the "wrong" book, or try things out in the "wrong" order. Pick any learning resource and get started now. You'll probably get distracted and move on to something else. Come back to it later or not.
Well C was my second language. I learned it on an amiga 500. But I quickly transitioned to a 386 (yes i know, a downgrade) but my dad put turbo c++ on it and I never wrote much ansi c after that. A bit for odd embedded targets, but mostly c++ my whole career. So I can write old fashioned c, and I don't start new projects in c, but writing c abi shims for c++ libraries or reading modern c is something I do with some frequency. Learning it would be fun maybe as I've never really used c99 or newer for anything.
Do bother with this stuff, it's super helpful and helps you understand your mistakes. Writing C without using sanitizers is like playing a game on hard mode, even for simple programs (especially when you're still learning).
You may leave static analyzers for later though, since they're more likely to bother you with unimportant stuff - but not much later.
