Do you have some propose of which book to buy. Not for completely beginers.
I found this https://www.amazon.com/Theory-laborator ... 1686046960
https://www.amazon.com/Networking-Mikro ... 3ZVJDQH3HE
https://www.amazon.com/MikroTik-Securit ... 3ZVJDQH3HE

I have this one, and do like it. (Do hope next edition has more on configuring VLAN with bridge/switch, but the basics are included already)
https://www.amazon.com/RouterOS-Example ... 692777903/

second, good

Do you have some propose of which book to buy. Not for completely beginers.
I found this https://www.amazon.com/Theory-laborator ... 1686046960

That is a good beginners book that should be paired with the first of the two, https://www.amazon.com/gp/product/B08S3 ... ype=ebooks.
He gives examples in CLI and GUI at basic levels in the first and the second covers more advanced topics.

I have this one, and do like it. (Do hope next edition has more on configuring VLAN with bridge/switch, but the basics are included already)
https://www.amazon.com/RouterOS-Example ... 692777903/

I have this one as well and it is a good reference book for using the GUI interface and is geared more towered the intermediate user. The only thing both books lack is IPV6 information and setup. For that, you will have to search the forums for the information you are looking for. Also, a good reference site for cheat sheets for various protocols is packetlife.net.

I have all of the above but waiting for this one due to come out in 2025.
RouterOS-7 by Example THIRD EDITION

Which one did you got?

My only books are Internet. (Forum, Google, YouTube)

There are a lot of info online. I've never thought about book... till now