the sculpt tool not actually sculpt for me. they work only on vertices points and they simply just shrink the face of the vertices i select. i tried adding more vertices but with no luck. when i see videos on youtube i see people really sculpt their model in detail, however i cant do that
There’s a few options here- the easiest is to turn Dyntopo on, there’s a checkbox for it in your header 
https://docs.blender.org/manual/en/latest/sculpt_paint/sculpting/tool_settings/dyntopo.html
i have another problem with the sculpt tool. it deforms my object, when i try to effect one side it effects the other as well.
its not enabled yet its still doing that
Is any of your object’s Scale axises a value other then the default 1.0 value?
If so try applying scale: CTRL + A → Scale.
Additionally, if you’re choosing the direction type, “Subtract,” it’s going to push the sculpted mesh towards the other side:
Imagine a bullet embedding into a wall.
ok and last question. why do my mesh become so wrinkly when i sculpt it and how to solve this? (besides shade smooth)
