As a holder and investor in more than 50 crypto projects, i do know the basics of each and can't go in full technical details about each one as it will take me years to digest all the information out there.
I know that steem is generated by something called Delegate proof of stake, so basically you mine steem by creating and voting for contents. and the more steem you have the more you can get as with any other proof of stake coin out there.
Also, check any big account in steemit, someone with 100k or more and open their wallet, you will notice that each time you refresh the page their steem or steempower is increasing by a small fraction, that is also a proof that it is a proof of stake coin.
For more information about this subject what are delegates or full nodes, i suggest you read the below:
https://www.steemithelp.net/new-page-3/