Overwhelmingly i find new comics by first befriending their creators and then checking out their works afterwards. So kind of word of mouth I guess.
2nd would be on the forums, mostly by threads promoting a single series or genre (ie I've not found the "under x amount of subs" threads very useful because # of subs doesn't actually tell anything about the comic itself and there are often 50+ replies to wade through, but threads like "check out my new comic, X!" Or "recommend me new fantasy comics!" Are useful resources.)
3rd would i guess be tapas Promos, ie spotlights, daily snacks, premium series, etc.
I guess it's worth noting that I'm a comic creator myself though, & i don't actually have that much time to read, so i don't spend a lot of time digging trending or fresh or whatever like a pure reader might. i Guess i need it to be recommended somehow for me to bother xD