I've learned to follow good advice from others even if I think it might be a little quirky at times. One great tip I have to share is - when I purchased my Bernina 930 about 30 years ago, the owner of the shop told me to always unplug my machine from the outlet, when finished sewing if only for a few hours, especially if I am leaving the house to protect the machine from lightning and power surges. I started doing that the first time I used my machine and have continued, and do so with all of my other machines as well.
I learned this tip from a fellow quilter about a year ago-when you stick yourself and leave a spot or two of blood on the fabric, use your own salivia instead of water to get the blood out- doesn't sound as sanitary, but really works much better than a wet cloth and doesn't leave a stain or ring either.
I've also learned never to attempt to cut a pattern or block, or sew one up if you are in a hurry or pressed for time- normally bad results on both counts.
The best tip I have is never be intimidated or afraid to ask others for help or opinions. No question is too dumb to ask!! if you have a question about something 99 times out of a100 someone else has the same question or concern and is just too timid or afraid to ask for fear others will think they are dumb. When in doubt always ASK for help.
This is why it is so great to have this board- there is always someone here with an answer.