UXP: Everything I need to know?

Hello

I am an extendScript user, did not bother much with CEP stuff or that sort of plugin, but since I learned that UXP can let us automate adding effects (and things we usually are not able to do) I got interested and added "UXP" to my to do list.

I would like to start by getting all the informations I might need at first, then consider using it, I might have read some mails about it.

Let' start:

1) What are all the things that UXP can do, that were not possible to do officially/conventionally before? I heard about adding effects, what else?  And at what extent we can control these effects. Or anything else.

2) I appreciate documentation but I what I like more is a straight "how to do step by step" tutorial that let you follow blindly how to run your first UXP example. This let you see it works with your eyes and whenever you want to learrn more you can start reading more. So my question is there any guided animation/video showing how to get into UXP without thinking much, just following blindly instructions? (Even if the video is not official, I am open to it)

3) I believe UXP has another forum which is not this one right? (I suppose I found it on my email "https://forums.creativeclouddeveloper.com/c/uxp-for-premiere-pro/105") 

4) Anything else?