There are four timelines on Mastodon:
HOME - Posts from people & hashtags you follow, in chronological order
EXPLORE - Trending posts, tags, links (on the official apps click the magnifying glass and leave search empty to see Explore)
LOCAL - All public posts from your server (on official apps click the magnifying glass 
then scroll to Community tab). This works much better on small-medium size servers.
FEDERATED - All public posts your server can see. Not available on official apps.
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@feditips it's a shame there isn't a "For You" page that would suggest content based on the stuff I already follow
That would require an algorithm, which is what this place is trying to get away from.
On here people are the algo, if you follow people who are interested in your favourite topics, they will boost posts that are also on that topic and you will organically discover new people to follow.
I've done an article about all the methods for discovering people to follow on here. Maybe one of these will suit you?
