welcome to cohost here are some tags you can follow while you wait for your account to be activated:
# The Cohost Global Feed : unofficial "global timeline", people use this tag for posts they want people in general to see. There's also variations on it for horniness, gayness, political affiliation, dumbassery... let the suggested tags be your muse! Come up with new ones! Use the search feature!
# The Cohost Local Feed (wherever) look up your town or state or country and see if there's a "local" feed. Or start a new one if there isn't one yet
# Cohost meta for cohost posts about cohost, both how to do things in a technical sense (css, settings, userscripts, etc) and how we want to approach things in a cultural sense. Discourse about discourse, if you will.
# ask cohost questions and answers. Cohost just started to roll out an "asks" feature, so you may see those posts on this tag. But also, just people asking for recommendations or doing polls, etc.
# pets of cohost cute animals. Replace "pets" with "cats," "dogs," "birds," etc if you want specific cute pictures.
# (people) of cohost artists of cohost, writers of cohost, streamers of cohost... generally whatever you're interested in, people on cohost are doing it and tagging it with this format, the search feature is your friend.
# css crimes people having fun with inline css. Mostly silly and fun. Some impressive works of engineering in the name of shitposting.
# tag suggestions (thanks @graham !) a tag for tag suggestions
Ways to find more tags:
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Use the search feature with keywords on what you're interested in, tags are suggested in order of popularity.
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Also, when you find a post that you like, it will usually be tagged with multiple things, see which other ones look interesting and click on them.
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Follow people and see what tags they use. Follows are private and nobody will harass you for following some rando. Also you can unfollow and people won't be notified, so you can err on the side of following too many people and unfollow them later if you don't actually want them on your timeline.
When there's no algorithm, it takes time to build a feed that you enjoy, but the upside is that most things in your feed will be things you enjoy.
Have fun! 
