from sewing …

Keep it simple, Stupid.
Adding layers or complexity to a project increases discomfort, not only in the making of the garment, but in the wearing of it. There is no such thing as a cool lining.

Just because something starts simple doesn’t mean it will stay that way.
See above. It was just a quick project, could be done in a few hours, ready in time for that “thing” I needed a new outfit for … until I a) realized I didn’t have enough fabric, b) did not have the right notions on hand and the store was closed, c) made a mistake while cutting, d) thought it would look better with a different neckline, sleeves or zipper location.

Take a trial run if there’s a chance.
When in doubt, baste. It can save a helluva lot of ripping later.

Creativity is often a messy process, but that’s not necessarily a bad thing.
Bits of fabric and thread end up all over the place. But if you end up with a project that you’re proud of, you figure out or learn something you didn’t know before, it’s worth the time spent cleaning up later.

Take care of tools.
Having a pattern in the right size, fabric and thread is not going to do you any good if your scissors are dull or your sewing machine is out of sorts.

When a project is complete, stop fiddling with it and move on to the next.
Adding gussets after the fact taught me that embellishment can end up being a frustrating exercise with less-than-impressive results.

Sometimes the instructions lie. Be optimistic, but also be prepared to change course.
Sometimes, you do everything right: follow the pattern to the letter, alter the fit of the garment where suggested and finish the garment properly. Then you put the garment on and the facings will either not stay where you want them to, the armholes are not where they need to be, or the length is just wrong. Trust your experience and instincts during a project, and be prepared to deviate from the existing plan.

Every project generates waste that needs to be dealt with responsibly.
An unfortunate side of being human is the amount of waste we generate in the act of living, clothing, feeding and sheltering ourselves. Scraps accumulate, so find uses for these, or be smothered by them.

Sometimes you just have to let it go.
When a project is finished and does not accomplish what it was intended to do, maybe somebody else can use it.

Diversity is absolutely essential.
What works for some people does not work for others. For example, on me, never a box pleat.