Course file

That is the case in courses, I'm not sure if that has changed. But in the course files there are .blend for each stage of a video course. In Press Start there's only one sadly. But don't be afraid to start over, it'll only have positive results. You'll get faster and get more experience points and you'll level up in no time. Plus you'll start to gain the Neo Sight, where you'll start to have the foresight of what approach can get you into trouble from the start, because you've been through that road before.

Blender is always buggy, not just Blender, also Maya, 3DS Max, Zbrush, Windows, Mac OSX, that's just how computers go. Blender is great when it comes to bugs compared to other software's. Those black lines might be to a modifier, try turning them on and off and see if they go away. Perhaps is a flipped normals issue or just as simple of going in and out of edit mode. Try things around, maybe download a fresh Blender version, because I'm not getting them when I open your file here.

Hi bbal12345 ,

Some Courses have this, but this one hasn't, but:

It is a good habit to make incremental Saves, each Lesson, or when you enter a new stage in your project.

This can be done really easily in Blender, if you Save As (SHIFT+CTRL+S) and then press the + sign:

Also, you might find a recent version of your file in one of your questions here, so you don't have to start from scratch...

...and, unintuitively, it is not a bad thing, to start from scratch sometimes (especially in the beginning of your Blender journey): it'll be a lot faster than the first time, and you'll be more aware of (some of) the pitfalls to avoid.

I opened your file in several Blender versions and I also don't get those black artifacts...

Make sure your graphics drivers are up to date!

From what I can tell, it's a mix of Ngons too big and having to disable clamp overlap so you can fine tune the bevel amount manually.

Right, both sides are not exactly equal (and both are wrong, just the screen-right one is slightly less wrong than the left side):

You need to straighten out both sides bit by bit, for instance, you can:

Make sure you are in Wireframe View and use Box Select (or Circle Select..)

Also disable Clamp Overlap, like Omar already mentioned.

Then there is still this angle buisiness that needs to be fixed:

Did anybody tell you that modeling is easy?

Exactly, modeling is hard, but no need to despair, hang in there, have grit, fall down and stand back up, in time you'll be running, nay, flying.

Hi bbal12345 ,

My image above is in Side (Orthoghraphic) View. This angle causes these isssues when Beveling (Bottom Orthographic View):

Now, in the following I have disabled the Bevel Modifier in Edit Mode, because it is only distracting.

Here is a way to get rid of that angle (I hope you like pictures!), but I highly recommend you practice Snapping on a simple model, until you feel confident with it!

Select these 4 corner Vertices and press F to Fill with a Face:

Click the + to make a new Transform Orientation, so we can move things perpendicular to that Face:

Select these Vertices and set your Snapping to Vertex (these are the default settings, I think):

Then press G, Z and hover your Mouse over one of the 4 corner Vertices:

...and hold CTRL to Snap to the helper Face and click to confirm.

Now Select that extra Face...

...and Delete it.

In Wireframe View (and Side Orthographic!!!!), you can select and Move these Verts:

...to something like this:

If you now make sure that all the correct Edges have Bevel Weight, you get something gorgeous like this: