I am trying to install JRE 8 to use minecraft, but I got a .tar.gz file. I have extracted the file, it is called JRE1.8.0_201 on my desktop, but I don't know what to do. Can I please have some help here? The guides I have looked at don't show what to do in a clear way.
If you download and install the latest Minecraft.deb package from minecraft.net, all necessary dependencies will be installed, including jre 8.
To install jre 8 manually, you can use the version available in pre-configured apt sources:
sudo apt install openjdk-8-jre
And to install the latest jre:
sudo apt install openjdk-11-jre