Unwanted triangles

I’ve been zooming in and finding all sorts of irregularities such as non aligned non intersecting edges. The puzzle is what am I doing wrong to cause these to occur in the first place. Unless I know what I’m doing wrong I can’t get it right in future.

I try to use Sketchup auto alignment with major axes wherever possible but still find that things get out of alignment.

I typically draw wire frame and then add external surfaces. Is this wrong? Should I be using pushpull extruder to create cabinets?

I have no idea how I ended up with hidden lines.

The error highlighting advice is very helpful thanks but I’m at a loss to know what’s causing the errors!

Thank you.

DL

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