Which computer field fits me best?

Hello I need advice on wanting to know the type of field in computers I should study under as a career. I'm into wanting to fix computers making sure there running at good performances , installing CPU and GPU's and troubleshooting. I'm having a hard time wondering what the name of that field for me cause I want to work undergoing to school for for a certification. Also I have no experience in this I'm very basic.. anyone got an idea? What field this sounds like fits me? Is this computer system Analysts or something else?
Which computer field fits me best?
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