How do I factory reset my whole macbook air computer?

I respectfully suggest that you investigate the possible causes of what you are experiencing before resorting to that fairly drastic solution — which might not help anyway.

A more conservative approach is to first determine if the same problems occur in "Safe Mode": Use safe mode on your Mac - Apple Support.

Use your Mac for a while in that mode to determine if the same behavior occurs or not. Then, restart normally.

Get in touch with Apple Support.

I recently had to do a full factory reset on my MacBook Pro. They walked me through everything over the phone and used screen sharing. They also emailed links and direct contact number if I hit a snag after the reboot.

It was super easy process with their real time help.

NikkiCrafton Said:

"How do I factory reset my whole macbook air computer?: My computer has been having some issues when I turn it on, with popping up a lot of the apps. I am wanting to go ahead and reset it to see if it will help."

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Remove Login Items:

Go To: System Settings > Users & Groups > Click your Username > Login Items > Rid of all items. Nothing would open upon boot as a login item.