Hi TwinStar and welcome to the forum.
Are you clear with the workflow? (I don't want to be insulting, but it happens often for people coming from 2D packages, I don't know anything about Sketchup, that there are problems getting used to the 3D workflow. But once you have caught on you will not look back. I say that from my own experience.)
For example 1) make a sketch to define your 3D objects outlines -> extrude that so you have a 3D object -> project a drawing from your 3D object.
Note that red in a sketch means that the lines are not completely constrained, red in a drawing means that the corresponding features of the drawing no longer exist on the 3D part. That can happen when your 3D modeling changes the numbering for the edges, for example.
If you already have a drawing finished of a 3D part you want to modify, be sure that for existing features that you modify the existing, but don't delete and remake them. In the first case the feature numbering remains, in the second the features will have new numbers and will not be found by the drawing, causing them to go red in the drawing, even those things that you have remade exactly as they were before.
Thanks dwc. Your question isn't insulting and a legitimate one. Skecthup is a 3D product and something that I've used for the last several years to create 3D printed products. There's a group of us collaborating on a few projects and I was using Sketch, another AutoCAD, and the other Fusion360. We all elected to migrate to Alibre to eliminate errors we were having in file sharing.
To start off, this is night and day different from Sketchup. I'm working to grasp the 'grammar' of this program and seem to be doing ok so far after several false starts. Dimensioning everything from a set point is different than being able to snap to.
So, I'm not sure if I have an issue now or not. I drew, extruded (both boss and cut), and then repeated to get my basic car side. Every sketch was a solid gray (defined) prior to extruding. Now, in sketch mode (Light Background Scheme) my car side is shades of purple (both planes and lines). It isn't until I hover over a line/plane that it turns red now and the corresponding cube next to the cursor shows the edge or face that corresponds. When I deactivate sketch there's no 'error or analyze pane' (can't remember the correct term from the tutorial) and the edge and planes behave the same when moving the cursor over them.