Hey Mohammed
The word “to” would be used to show a place where we are going!
“I am going to school.”
“Let’s go to the park.”
“When will we go to the beach.”
See how all those are places and all use “to.” On the other hand, we can just use “go” to show WHAT we will do.
“Let’s go see the fireworks.”
“I’ll go shopping today.”
If the sentence answers “what will you do” then you can just use “go” on its own! Hope these tips help :)