I have to agree with the poster above. The best tool so far has been this board! I just recently discovered it.
I'm amazed at how much I've learned just perusing past topics. I especially love the Elmer's glue trick! This has saved countless ripping outs & removed a lot of the frustration I'd found in sewing patches together.
The other trick I really liked was marking the bobbin thread for the first few rounds so that I'll know when the bobbin thread is close to running out. I only have a very old electric Kenmore sewing machine...it just barely zig zags let alone beeps when the bobbin thread is low!