Where could I find VPN setup guides/simulators?

Hi, I am currently a lvl 1 tech support. I am looking to expand my networking skills. More specifically in VPN setups.

Could you guys recommend any study/guide materials. For VPN setups. Most of the devices we deal with in regards to setup of VPN are cisco devices so any Cisco CLI guides to setup a VPN would be awesome.

I have read about using packet tracer to try and simulate an environment is this a good way to learn to do this?