hmmm... idk... advice regarding 4chan is almost always a troll lol
I certainly understand your hesitation, but not everything is cancerous. Though I think I'm pretty desensitized from the internet in general. Almost nothing phases me anymore :/
/v/ is pretty cancerous. It's not /b/ level, but it's one of the worst boards. It has awesome threads once or twice a week, though, like 11/10 threads, but that's about it.
/pol/, /lit/, /mu/ and /vg/ are decent, depending on the day. You can either learn new things or talk seriously there. /r9k/ is the board you need to avoid if you want to keep your sanity or have had issues with women in the past. /gif/ is pretty good but nsfw.
/soc/ makes for some good fap material. There is stuff for everyone on 4chin.