Some parts of the model doesnt follow the rig correctly

Support Animation and Rigging
1

This its the first model i made but after trying and searching i havent found a solution

2

Hello and welcome aboard!

Are all these problem area separate mesh objects? If so, for the first and third problems, the hair and the feet, you could do one of two things.

You could combine the mesh objects into just 1 object, and delete parts that overlap. Like where the back of the head mesh and the hair mesh meet.

Or you could add armature modifiers to the mesh objects and weight them to the bones that will be deforming them.

Hope this helps,
Randy