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how do you start weight painting? in blender?

Just use google wiht blender and weight painting as your search terms lots of tutorials will pop up watch a few then try it out on a non critical thing that you already have a blend file for but us "Save as" to give it a new name so all your learning is nondestructive

Enjoy the Choice

You need a rigged object where the mesh has vertex groups with names corresponding to bone names in the rig. Then: