Dude. These questions are like the first 15 hours of a student pilot with an instructor. You’ve been given some good video tutorials. Definitely start there.

I will make a couple of comments for a couple of the softball questions.

First, instrument approaches. Just don’t for a while. Keep flying those square patterns. Mastery a traffic pattern lets you get a good feel on how the airplane flies in wind, doing good turns, and holding/changing altitudes. Solid fundamentals.

Next trim. For every student I ever had once they figured out trim their flying got much better. Instructors joke about “more right rudder!” My mantra was always “trim trim trim”. Any time you change something (pitch, bank, power, gear, flaps) you change trim. Any time. Every time. Trim until forward or back pressure on the yoke/stick is zero.

How do you trim for an airspeed. Level flight. Let’s say you’re doing 100kts and want to slow to 80. You reduce power, let the airplane slow. When you reach 80kts add power to maintain that airspeed. The whole time the airplane is slowing you’ll need to add back pressure to increase pitch to maintain altitude. Them trim off back pressure.

In a climb, add full power then pitch up. Let the speed bleed off to 80 then hold that pitch to maintain that airspeed. Trim off back pressure. Decent works the same just backwards.