This is a tip I found by accident due to hitting a key twice. The result was a bit of a surprise.
If you only need to run a few commands as root, typing sudo before the command will allow you to do this.
However, it's sometimes useful to assume root so you don't have to type sudo in front of every command.
A typical way is to do this:
sudo su -
But this will take you out of the directory you were in. Here's how to stay in the directory:
sudo su --
Just use a double hyphen instead of a single hyphen. Simple!
Photo by Lawmaker