How to do a normal jump in Unity C#?

Question

C++ / C#

Please help me make a normal jump (at least write it yourself, at least a snare, at least something)! Below I will describe which one he should beat. I'm not kidding now, I ate 10 rowing hours (3 days for 3-4 hours) to make a normal jump, reviewed a bunch of videos, and nowhere did a normal (ideal) jump beat.
1. It should hit smoothly. Example: https://cloud.mail.ru/public/4Mnt/2Sbcsm9pH
2. Without such a bug (I don't know how to remove it). Example: https://cloud.mail.ru/public/4jzB/4zhJbnSXs
3. So that it does not fly, but bounces normally. Example: https://cloud.mail.ru/public/4H6D/rHZi1LX6B
4. So that when jumping, you can control the character in the air. Example (as it should not be): https://cloud.mail.ru/public/5d31/2m9diKp2m
5. And Straight, it is imperative that after shift (acceleration) + space (jump), he does not jump like a jumper. Example: https://cloud.mail.ru/public/41Aj/2EA3SbHh5
---. This is not necessary, but just tell me how to do this so that he jumps to the same height during normal walking and with Shift (acceleration) and not like this: https://cloud.mail.ru/public/3V7j/3fTw19Cvw
https://assetstore.unity.com/packages/essentials/a... - NOT SUITABLE when I release the controller (W,S,D , A) it is still moving for about 0.5-1.0 seconds, but I need it to stop smoothly right away.