Found in 1 comment
by taw55
I'll add some perf suggestions:

High Performance Websites and Even Faster Websites

These two on website performance are good, though they're a bit dated (pre http2 etc).

High Performance Browser Networking

I never fully read this one but it's really good, probably required reading if you're serious about webdev

CSS: BEM/OOCSS/SMACSS methodologies, they make you think critically about the structure of you styles. Harry Roberts does good writeups on maintainable css.

I second Don't Make Me Think and I also liked Eloquent Javascript (that zoo has a bunch of new exotic animals since, so I don't know if it's the best bet. It's a fun book though)

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