Dear English speaker, please help me.

Forms of the verb "to look" are used more in the imperative mood:

"Look at that beautiful sunrise."
"Look at this [pointing at something or giving it to you]."
"Look out!" [when you are in danger BEING in danger or endangering others]
"Look for me; I'll be in about the middle of the third row."

Note that this is grammatically the imperative mood, telling the person spoken to do something, even if delivered as a suggestion.

This is similar for both "to watch" and "to listen":

"Watch out!" (obviously a command)
"Watch for falling rocks" (a road sign in the American West)
"Watch for deer", etc.

All directives.

"Listen! Do you hear <that|the bird|the vehicle|that squeak|something that sounds like a baby crying>?"
"Now listen, you'll be looking for the RED number, not the BLUE number."
"Listen up! There will be no admission after the performance begins."

All, again, are directing people to pay attention, etc.