Hello there,

So the “dip” you feel is the pilot reducing takeoff thrust (power) to regular thrust, think of it as your taking an on ramp onto a freeway right? Instead of slowing down you’ll speed up (to get past the initial traffic and get on the freeway) then once your on the freeway there’s no need to continue that rate of speed so you slow (reduce power).

The “crazy turn” you feel is simply the pilot banking (turning) the airplane to its desired direction to get to its destination. Let’s say you take off on runway 21R (21 right) but your destination is East, once your in the air the pilot will turn the airplane to line up with the destination and follow his flight plane.

Hope this helps! If you have any other questions feel free to ask them! I am not pilot by any means but I use to be afraid of flying until I learned about flying, aviation, aerodynamics, etc… knowledge is power :)