Question

what should you do if you want to keep your browsing completely anonymous?
use only incognito or private mode.
use a vpn or proxy.
delete your browsing history manually.
use a secure browser extension.

Explanation:

Incognito/Private Mode only stops local data storage. Deleting history manually doesn't hide from ISPs. Browser extensions may have vulnerabilities. A VPN (Virtual Private Network) or proxy masks IP address and encrypts data, providing better anonymity.

Answer:

Use a VPN or proxy.