Start at https://hive-engine.com/

If you are on a browser I suggest using Hive Key chain to log in https://hive-keychain.com/.

Now in Hive engine you can click on wallet and see that you already have some tokens

You can deposit Hive for SWAP.HIVE and use that as a currency to buy other tribe tokens.

Most tribes will pay you a percentage each day for staking their coin.

You can buy and sell in market.

I usually make a limit sell based on what I think the value for that coin should be.
That means I sometimes have to wait a long time for the trade.
Play around. You will get the hang of it.