Read the manual if you haven’t (from the game’s main menu: Extras → Manual)
It’s really good and is what made the game “click” for me.
There are some great tutorial videos by the author of the manual, linked at the end of the manual, or for convenience, here: https://www.reddit.com/r/OldWorldGame/comments/u8nkru/velociryxs_new_video_tutorials_for_old_world/
The discord also has some great resources and a bunch of friendly people very happy to answer #gameplay-questions live – here’s the link Old World
Lastly, re: all the little icons, I made a cheat sheet for that as I remembered back when I was a noob, I was confused by the very same thing:
