Insert the needle under the last stitch on the wrong side of the fabric
Pull the thread through, leaving a small loop
Pass the needle through the loop
Pull tight to form a knot
Repeat once if needed for security
Trim the thread close to the knot
For sewing machines, backstitch a few stitches at the end
Lift the presser foot and remove the fabric
Pull the thread tails to the back if needed
Tie the thread tails securely and trim excess