Through multiple ways: - In the Discover feed (a default feed) - Through a repost in the following feed - In a custom feed (e.g. art or fandom related or general use feeds) - In hashtags when searching for them - Through Starter Kits made by other people - Existing following from other socials

There's also the Sky Follower Bridge which is a plugin for Chrome and Firefox that lets you go into your Twitter follows and find accounts that are on Bluesky and follow directly from there.