I mostly run Mint, so usually just thru the built in software store. If i cant find an app there, i download from the respective website. I'm not super knowledgable with the terminal, so this has worked for me. I'll never go back to Windows or Mac, not ever.

Debian like distro: Apt install package You can add new repositories Apt add repository ..... If you download the .deb package Dpkg -i package.deb With source code Make and make install