The best way I found stuff was by searching on Youtube. Most things are really outdated, but the editor actually didn't change a lot. Keep in mind the editor can look drastically different depending on how you have it set up. Some functions broke or were disabled etc but most of it all works and can be learned from. Most of the time you can just open Blizzards campaign maps to see how they did stuff and learn from that.
I saw a tutorial on the StarCraft II homepage
But most of them are old, so they are very different from the current editor.
I would like to study how to use the editor as much as possible through the latest resources
Where do I have to go?
The best way I found stuff was by searching on Youtube. Most things are really outdated, but the editor actually didn't change a lot. Keep in mind the editor can look drastically different depending on how you have it set up. Some functions broke or were disabled etc but most of it all works and can be learned from. Most of the time you can just open Blizzards campaign maps to see how they did stuff and learn from that.
https://www.youtube.com/user/LazZProductionGaming
https://www.youtube.com/channel/UC2poAt8eAOa3f8JrmdVKuQA
In reply to GiveMeCoke:
I'll do what you told me. Thank you very much.
Most of the tutorials listed on the wiki are still valid.
https://sc2mapster.gamepedia.com/Tutorials
Contribute to the wiki (Wiki button at top of page) Considered easy altering of the unit textures?
https://www.sc2mapster.com/forums/resources/tutorials/179654-data-actor-events-message-texture-select-by-id
https://media.forgecdn.net/attachments/187/40/Screenshot2011-04-17_09_16_21.jpg
Use google, type "site:Sc2mapster.com" and then your search terms. Works like a charm!