Step 1. Start drawing celtic knot of the heart with the following easy form of the heart.
Step 2. Add several connected lines.
Step 3. Draw one more heart on the outer side of the first heart.
Step 4. Now, add 3 petals the way it is shown on the picture.
Step 5. Erase the lines on the indicated areas.
Step 6. Everything is ready! Celtic knot of the heart looks great.