How to install IodeOS on Xiaomi Mi9? (need a clear guide)

Hello, I would need a clear guide on how to install IodeOS on Xiaomi Mi9

I am a beginner in installing new ROMs and I don’t understand anything about what is explained on the website:

It would be great to have a clear step by step guide for regular users who have no clue about all this and want to migrate from Android!

For me, this is a clear step by step guide.

But, how to use adb, sideload, recovery (twrp) can not be part of that.

If you don’t know anything about that, then a step by step guide is not the solution. It cannot go into that deep, if no knowledge is available by the user.

It’s on you to read and learn about all of these topics first.
To many prerequisites…