Wait a minute....I think I am starting to understand..since I have more material, I can start playing "riskier" ? And my opponent will move away?
Chess Lesson: "Material Advantage: Trades"

I will find the lesson to see exactly what you mean and give more specific feedback later. Hope this helps you.
{{NOTE; fifteen points is a VERY extreme example. With enough skill and a clear plan you could pull this off with a 3 point advantage.}}

it is sound strategy to get up material and then base rest of game into trading into a won endgame

Suppose you have a queen, 2 knights, 2 bishops and a rook and your opponent has a queen, 2 knights and 2 bishops. You want to trade queen, knights and bishops because you can win the endgame up a rook without effort and your opponent can do nothing about that. If you don't trade pieces you can still blunder them or get mated. That's why trading pieces is generally the safest way to convert a material advantage, while playing risky is exactly what you shouldn't do.
I recommend you read these articles: https://www.chess.com/article/view/keep-it-simple-silly
https://www.chess.com/article/view/how-to-play-when-you-re-winning-easily
Just think of it mathematically: if you have a slightly larger piece value total than your opponent, say 15 points to your opponent's 10 points, and you trade 5 points away against your opponent, then the ratio between your strength and your opponent's strength goes from 1.5 to 1.0 to 2.0 to 1.0, so your relative advantage becomes greater through an equal exchange.

I am doing some chess lessons.. in one of the lessons "Material Advantage: Trades" I gave up one of my knights and the opponent's bishop gobbled it up, and the lessons said: "Correct". Why is that??
Besides that, the answer said: "Correct - White forces the trade of several pieces, making the position more simplified and bring him closer to a win." Seriously? Can someone please explain to me what is going on here? Now giving up pieces instead of defending them brings me closer to a win???
And it says: "Force trades when you're up". WTF? Is that true?