I don't know

I started playing because of an event, but there are still parts I don't understand. I thought you gain 5 EXP every time you gather logs, process them, collect them, and then transport them with a truck to level up. But I'm also getting 5 EXP every time I cut the flesh-colored trees at the gathering spot with a saw. For other colored trees, I only get EXP once when I first obtain them, but it seems like all the flesh-colored trees give me EXP lol. Also, the hidden quest says to sell Golden Timber Blocks, but I guess it's not the regular gold-colored wood. Should I move on to the next area? It's a simple game, but I don't know so many things lol.