Creating Faces Issue

I keep repeatedly having this issue. I am a beginner on SketchUp and am mainly using it to create a 3D model of my apartment as I want to do some renovations on it in the future. I am quite obsessive and things being off bothers me a lot so I am trying to do it as close to reality as possible.

Basically, the apartment is slightly angled because the street it was built on is on an angle. I am having trouble creating one big face on the outside of the structure and I have zoomed into all the corners, redrawn the lines, checked that they are all on one plane and I still cant seem to figure it out at all. Im sure I am missing something obvious but I keep having to redo the whole thing because I get stuck on something and then cant fix it. I have one side that I connected by drawing lines through the (desired) face and one side that I deleted all the lines because there was so many and I was trying to mess around on that side to find the problem.

Anyone have any insight? I am sorry by the way if I am missing something super obvious… I usually come to ask for help as a last resort… Especially attaching the file as I probably did it super backwards and weird.

newest trial.skp (117.9 KB)

Your edges are not coplanar. See the black edges, they are not parallel to the red ones

Maybe this helps you. Use references to axes and points better than guide lines.

As all of Sketchup Sages usually say…
You could benefit yourself by spending some time at The SketchUp Campus. This is a site that will provide the basics for learning the SketchUp modeling process. Also, spend some time at the SketchUp SketchUp YouTube site. It provides much information including how to use each tool.

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This is very helpful. Thank you very much. I will check out SketchUp Campus.