[Hack3rcon]

If you're using SSL they can only see the websites you visit, but they can't see the data you send because it's encrypted. You could get around this by using something like TOR or a VPN service, but remember that the VPN service now can see the domains you visit.

How can I test that my connection using SSL or not?

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When I normally browsing the internet then can the ISP see my activities even if the browser using HTTPS protocol?

Yes they can.

HTTPS encrypts the traffic from your web browser, to the destination (website). It does not anonymize your online activity. If you want to (almost) bulletproof your online navigation, apply the following.

Tor over VPN > Tor Bridges (Entry Node) > Middle Node > Exit Node (14-eyes countries restricted) > VPN over Tor > Private Search Engine (Built-In Proxy) > Destination/Website.

Also, disable WebGL, WebRTC, Canvas & font fingerprinting, encrypt your DNS servers (both primary and secondary) and change the browser's User Agent String, namely to anonymize the OS you're using. Be sure to add one that's used by the majority of online users.

This covers around 25% of my current overall configuration. It's way beyond the scope of this post to document everything.

About:
"Also, disable WebGL, WebRTC, Canvas & font fingerprinting, encrypt your DNS servers (both primary and secondary) and change the browser's User Agent String, namely to anonymize the OS you're using. Be sure to add one that's used by the majority of online users."

Can you tell me how?