I'm a beginner, so everything is interesting to me. I'm enjoying the shows very much and learning a lot.

That said, I'd like a show on sewing square necklines (and "triangular" ones with the vertex at the neck – bad description, but I hope that it makes sense) in dresses or tops, etc. I think that it's a matter of knowing how and where to interface, how to stitch a corner and how and how much to trim and clip the seam allowances but that is exactly what I don't know.

PS: btw, trimming and clipping seam allowances is one of the things that really scare me. I have nightmares of garments unravelling due to excessive trimming. Therefore I would also appreciate some tips on that.