What are the most common sewing machine features I should look for? 

Tension control, buttonhole feature, stitch functions and the type of bobbin the machine takes should all be considered when selecting a sewing machine...

Tension control

Some models have "automatic tension control". Automatic tension control really only applies to the top thread on the sewing machine. The bobbin thread tension is still manual on all machines. Some form of automatic tension control is a benefit as it eliminates another part of the process.

Buttonhole feature

Most models have a buttonhole feature but all

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