Pinner said - I am one of the many sewers who avoid tension dials like the plague. This is the best explanation that I have ever seen.
Thread weights can vary greatly these days and the bobbin tension will need adjusted accordingly, so even if your sweet mama always said to never, ever, ever touch your bobbin tension, this easy-to-us
yessss, understanding thread tension - where have you been all my life?
Bobbin tension (and other sewing tips too!)
How to finish the edges on anything sheer. Best tutorial ever for finishing fine seams
15 Things Home sewers Can Learn From Industrial Sewing
Binding with knit tutorial.
Presser Feet Tutorials: Wow, an amazing video. I never thought 20 minutes would go by that fast. Covers a lot of different presser feet, showing installation, settings and examples of usage with enough detail but no excessive redundancy or chatter.