Is it required to watch all seasons of CSI?

Hi friends, sorry if this was asked before (I couldn’t find anything). I want to jump back into CSI (original one), I’ve only watched them on TV when I was young. Now, I was wondering if it was "required" for the plot, to watch all seasons, or should I focus on specific episodes/seasons only? Thank you!

Also, I remember an episode where there was someone tied to a tree (I think his eyes were cut off or something), but I can find anything on IMDB. Lmk if you have ideas.