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I have a powerful computer with Windows 10. Pieces of shit Microsoft are ending support this year.

I want to install an inidie OS that is supported to keep using my computer.

I know there are Linux and other indie OS.

Can anybody explain what can I do?

I know there is an OS with high security for using internet, that deletes all new files after browsing, so it's 100% malware free, but don't remember the name.

Is there a Linux version with the same security for internet browsing?

Is there a Linux version that is easy to use like Windows for non technical users?

I also need to know how to inistall a second OS on my computer. And if I can install more OS than just another one.

My computer has 2 discs. C is 250 GB, D is 1TB. If this matters. Or can I install the second OS on the same disc?

Enlighten me about everything I need to know. I don't even know what else to ask.

I know Tails OS and Qubes OS are the most easy to use for non computer nerd.

Are there more easy to use anti-malware secure OS?