I reset my computer but is still showing folder with question mark

That is resetting the NVRAM, please carefully read: If your Mac doesn't start up all the way. If it still will not start after doing everything in the advice letter then your next step is making an appointment at your local Apple Authorized Service Provider. If you don't know of any please click Apple Authorized Service Provider Locator (AASP) & Genius Appointment to begin finding one in your general area.

i did the NVRAM reset but then it told me to either install macOS or eestore from time machine but when i saw i want to install it keeps giving me this what do i do now???? it was working fine an hour ago and this all happened so suddenly

What steps did you follow? Do you have a backup of your data? If so, what kind?

Cheers,

Jack

Do you have a backup of your data? If so, what kind?

What year is your Mac? What is its current macOS version?