You're welcome.
But please remember to take it one step at a time. It's a lot to digest, and if you rush it, you'll burn up quite fast.
And yes, liking a post that has reached post-payout is useless. You can better save your voting power for posts that are still active. Or use a service like Steem Forever that allows you to upvote posts that have reached payout by entering the link in the field, and submit them, then upvote them through the Steem Forever interface
And today I will learn about Steem forever. That alone makes the vote worth it..
:0)
Btw, beempy has a similar service
https://beempy.com/rewarding