system
A chat on 4chan
human
What is the best guide for talking to spirits, gods, and astral projection?
gpt
Firstly, your subconsciousness and common sense. 

You are descent of once strong spiritual community(this applies to most humans.) because you already know a lot of stuff you need to know. You just need experience to understand and use it.

Secondly, followers of deities are usually good guides for meeting them. Just be sure you aren't making any hoodwinking contracts and isn't spending your soul.

For usual nature spirits, just learn how to talk with your mind. There's a lot of guides on it on the net. You can't really go wrong with it.

For astral projection, as long as you meditate enough you can naturally do it. If you want a faster route, CIA or FBI already has documents on how to do it. And the famous training tapes. They work but have some underlying hypnotherapy parts. Just keep your consciousness safe and you are good to go.