When I started to really use Linux I followed the common suggestion to read all the relevant man pages. I skipped a lot. But I still sometimes feel like it is useful that I've read about a thing or another before. I attempted to read the bash manual back then, but it was just too much at once.
Many years later I started to use more of my shell's potential, which was still bash. Now I'm used to write scripts and have written a relatively large application in bash, but had never read the entire bash manual.
Until this year. I've read the entire bash man page. And yes, I did learn useful new things.