Can't import standard assets, unable to follow tutorials now?

The tutorials are using things from the standard assets such as cinemachine, but when I go to assets/import package/ it shows only "custom package", what gives? I tried to search for where to download cinemachine but I simply cannot find it anywhere, and I don't see anyone else having this issue.

Please help, thanks!

Open the package manager:

Window -> Package Manager

From there, search for and import Cinemachine.