With all the hype and positive words said about Sonic Mania, I'm seriously considering picking it up. However, I have no idea how to play a Sonic game.
They've always been confusing to me. Are you trying to acquire and hang onto as many rings as possible, or do they not really matter outside of lives? Rings can get you extra lives when you get to 100, but they are mostly important because if you get hit with 0 rings, you die. If you get hit with more than 0 rings, you lose the rings and have to find more or you risk getting killed. They also tend to be important if you want the Chaos Emeralds (see below).
Are you trying to complete levels as fast as possible or are you supposed to regularly stop and explore? The focus on speed in the game is a little confusing to me, as it seems like you'll be quickly ushered through gigantic parts of the game in the name of speed. Are you expected to kind of backtrack and explore the area that you just zoomed through? Depends on what you want to do. Do you want to get all the Chaos Emeralds? There are different ways to get them in each game, but typically you need to have 50 rings then trigger a special stage. In Sonic 1, that means having 50 rings at the end and jumping into the big ring. In Sonic 2, that means having 50 rings and getting to a check point then jumping in the star ring that appears.
Otherwise, your main goal is to get from one end of the stage to the other. Sometimes that's the end of the level, sometimes you fight a Robotnik boss.
Should you be seeking out every TV to smash? What rewards do these garner? What about enemies? Should you be trying to kill them all or is it okay to just run past them? TVs have special abilities, like invincibility and speed shoes. They are almost always helpful. You can fight or ignore enemies at your discretion.
What do you need to do to acquire the giant ring (no idea if that's what it's called)? What makes it invisible/unattainable and what unlocks the ability to acquire it? What's the benefit of acquiring the giant ring? See above. The Giant Ring usually leads to Chaos Emeralds.
I have other questions, but I guess I'll just leave it at that for now.