Can i edit terrain or resources on terrain in-game through debug command?

Short Answer: No

Long Answer: Not ingame, but if you are looking to create custom maps tiled is a great resource, this is the place for you:

https://www.games2gether.com/endless-legend/forum/15-modding/thread/5782-map-creation-tutorial

Other than that, using the startup command --enablemoddingtools will give you access to some cheats and a few debug options.

Hope this helps.