Shape selection assistance

How can I select one face of an object without it selecting another face next to it? I am trying to build a gear. Also, how do I select just one triangle and not the circle and the other triangles? I double tap the triangle, but it selects the entire object.:https://imgur.com/a/wl9NP0I

Hi and welcome,
You should read this article.
Sharp3D Help documentation

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I have visited this link already multiple times and I still have no clue on what to do. Do you have any other assistance that you could provide me?

Does your Items list show 3 bodies? Two triangles and a round disc?
I ask because it appears your two triangles and disc is one solid body, not three.