Where can I learn electric welding, argon arc welding and carbon dioxide shielded welding? Which one is eager to learn?

Comparatively speaking, carbon dioxide gas shielded welding is faster to learn. But with the foundation of manual arc welding, learning argon arc welding is relatively faster. Personally, if time permits, we can start with manual arc welding and want to learn. It is suggested that you can go to a regular welding training school for systematic study and field trip. I hope it will help you from the comprehensive consideration of teacher environment, hardware training and employment. Thank you!