Yes, steemit was the first app. I was first introduced to bitcoin (no surprises there, as i am sure 2017 bull would have made btc a household name), then ethereum and then during that time to a whole plethora of sites, including steemit, and steem blockchain. And I think the first step for anyone would have been to be introduced to steemit. The site is probably the most used dapp on steem blockchain. 

I joined in Apr 2017, with the goal of acquiring steem, as much as i can, and have stayed ever since getting to know more cool dapps - actifit, steemhunt, musing.io. i don't get steemmonsters but i have tried that too.