I have plantar fasciitis what is the best cure?

Combo treatment. . The more you can do together, the better: #1: supportive shoes. #2: firm inserts or orthotics. #3: oral antiinflammatories (check with your doctor). #4: stretching your foot and calf. #5: icing (10 min at a time). You may also need physical therapy or cortisone injections, or eswt if available in your area.
Conservative care. Stretching, physical therapy, injections, night splint, orthotics and oral medication.