Posting through the Leofinance provides authors with their full rewards. When posting using the leofinance tag through other front ends, such as Peakd and 3speak, 10% of author rewards (curation rewards are still at full payout) are withheld and burnt.
Post to Leofinance community but all post, through peakd, can be crossposted to other communities. You can also use the tags for other communities (neoxian, palnet, or whatever).
Those are miners for the LEO token. That allows people who buy the miners to get LEO automatically. Can also get that by delegating HP to the leo.voter account.
There is a lot of information on leopedia.io. There might be some more information about Hive Engine tokens.
Bear in mind the website for Leofinance.io is being redone and should be released in a few weeks. Right now, the site is dependent upon condenser which limits what can be done.
Upon release, the new website can be updated to provide more diverse features and have a site that caters more towards finance.
Glad to see you on here 
RE: Looking for more info on how LeoFinance works