I found this confusing too I think the interests section was to try get you to find people and feeds.. but after that, the feeds (or just the Discovery feed?)

I found this confusing too I think the interests section was to try get you to find people and feeds.. but after that, the feeds (or just the Discovery feed?) are influenced by who you follow.. so if you are offered a 'bad' (for you) starting group of people to follow, your feed will probably not be great until you find people you like (that are active) and follow them too. Also was unsure what "Follow all +" button was.. why not "Follow Selected".. and a 'deselect all'.. I had no idea who all but 2 of the suggestions were. Not going to follow a random "Computer Scientist" the system picked for me sight/posts unseen.