How can I get a China visa

Sorry, you can't apply for it online. You have to submit your application documents first and make an appointment in the meantime. Then you need to attend an interview on the appointed date. Next, you should wait for the notice and go to collect your passport. The application documents are different according to your travel purpose. If you travel for sightseeing purpose, you need to provide your passport, a photocopy of your passport's data page, a filled-out application form attached with your recently-taken photo, and round-trip tickets and hotel bookings.

Can I apply visa online from guinea

No, you can’t.