In your opinion, what is exposition?
Having characters explain something instead of showing it.
What is too much of that?
When it's noticeable.
Is there a such thing as too little?
Yes, it's showing too much of the boring bits and taking too long to build a foundation/setting/atmosphere.
If you need to explain a certain point in your comic, how do you handle it?
Place it where it should naturally go (time wise) and have the right character speak on it.
The navy seals are on the beach about to attack the stronghold.
THAT'S WHEN they decide to go over the gameplan - not for them, but for you, the reader, to know how all the parts fit together and whose job is what. Phrases like "One more time..." are big hints.."So wait, we need to...."
SIDE NOTE:
Writers get around this by creating/adding a character that needs reassurance or is clueless enough that the plot keeps getting explained to them. When is it good? Ripley in Aliens- being explained how the gun works. She needs to know it then and WE will also appreciate that info later. When is it bad? When she uses the loader and sets up an obvious foreshadow.
When is it good? Luke asking Han about space warp- that's what Luke would do in that situation.
When is it bad? C3PO in any scene. He is the exposition machine. - even all the replies to R2 are plot-plaining breaks.
Worse his inclusion on Endor (planet with the ewoks)
- They are on a infiltrate and sabotage mission.
- He's GOLD, not suitable for camouflage
- He's slow and clumsy and loud
- he's a coward
- his only skill is language and R2 interfaces with everything.
He's only there for his exposition and where else was he going to be?
He actually shouldn't be in these movies anymore. He's an annoyance even to the main characters.
Although the plot twisted into him having a role, there was no way anyone could have accounted for a need for him.
So the second part is designing a character that helps tell the story... but shouldn't really be in the story.
Lastly, I find the worse offense is explaining or describing something
I'd rather see than whatever is being shown.
Making a previous time in history more important/interesting than
the now the story takes place in.
"It was a time of great danger and magical beasts ruled the skies and the land was filled with war and great battles"
The writer's escape route- is to do that so they can focus on just a small set of characters doing everything significant.
It simplifies the narrative.
That's the problem with comic books and their own universe. How the heck can a team battle and destroy bridges and mountains and...and...and NO OTHER heroes/villains show up or get involved- yet a simple bank robbery or heist can get the heroes attention. lol