Lines keep appearing when I orbit or move or zoom etc

Please read …

Texturing is the last step you do after modeling. You should have a dedicated modeling scene that uses a fast style in monochrome render mode.

Also … your profile does not say what your graphics card is. (2020 is not a graphics GPU.)

See: [Howto] Where to find Hardware Graphics Info for your SketchUp forum profile

The photo shows a moire pattern, but this may be from the camera.