USING FGONS IN BLENDER TO FOLLOW A TUTORIAL THAT USES NGONS

DISCLAIMER!

I don't usually even use Fgons. And not even saying this is a great workflow. Up to you. But it came up in a thread and it is certainly - with careful use - a solution to follow tutorials not made in Blender that use Ngons.

1. Cutting selected faces with the knife tool.

2.  The resulting cut and then select the triangles and choose Fgon.

3. The triangles now have the appearance of being one Ngon.  In this case two side by side using Mirror modifier.

4 and 5. Making more cuts.  ( In other words just keep following the tutorial making the same cuts)

6. Smoothed  and with Subsurf Mod, they look and "act" as Ngons in Edit Mode.

7. In object mode with "Optimal Draw" checked in the Subsurf modifier. You can see the triangles are sill there. They will cause the same problems as triangles, but they are out of your hair to follow the tutorial.

8 And 9. Edit the Fgon mesh as if it were Ngons.  Now you can finish the tutorial in EDIT MODE and see it just as it is in the tutorial.

 10. After you finish the tutorial it is time to clear the Fgons.

11. In Edit Mode now you have triangles again.

12. Using any techniques and tools you know, now take and merge the triangles back to quads. There may still be triangles left.  And finally...

13. Clean up the mesh by removing triangles. For each one it means you have to add  or remove a loop. Here is the final quad mesh that should be close to the original if you work your polyflow right.