This 4-part tutorial by Heather Thomas helped me a lot:
https://www.youtube.com/watch?v=LLWFmOForjU
Also, Leah Day's videos are fantastic.
https://www.youtube.com/watch?v=fFcI...1F4B76430BB141
For paid online classes, I've found the following sites helpful:
iQuilt (coupon code "1995" gives you the class for $19.95 + 20% off if you're an AQS member) - Cindy Seitz-Krug
https://www.iquilt.com/course/successful-machine-quilting-basic-beyond/
National Quilters Circle (new members get their first year for just $10, no commitment required)
Some classes on NQC are free, others are part of paid annual subscription, plus they sell other in-depth video tutorials. I've tried all 3 components & have found them all to be wonderful.
http://www.nationalquilterscircle.com/
CreativeBug.com (first 14 days are free + you get 1 free class for life, $7/month after that) -- Sue Nickels
https://www.creativebug.com/classser...uilting-basics