Bone won't move certain vertices/edges

Hi! Im new in blender and i learned alot about it, but a problem came up, i looked everywhere and i can’t find a solution to this… Ok so here it goes: I was making a model about a humanoid, everything went well but when i created the armature, some bones don’t seem to affect some vertices of the mesh. Here’s a couple of pictures of the problem:

Anyone know how to fix this?

Check if those vertices are assigned to the vertex groups corresponding to the bones.

Im new and… that’s like chinese to me XD how do i do it? lol

Thank you! I’ve been looking for a solution for days.

Grate … Love it. some this one web site are very usefull. i will create some like that.