How do I heal/prevent heal spurs?

Focus on the cause. Heel spurs themselves rarely cause pain. Many have spurs that are incidentally ("stumbled upon") found on x-rays. Plantar fasciitis is often called "heel spur syndrome, " even though the plantar fascia (a thick ligament) causes the heel pain, not the spur. Stretching the calf muscles, avoiding weight gain and overtraining and wearing high-quality footwear are the keys to preventing pf.
Proper footwear. The best ways to do this are to wear good fitting footwear; and stretch well before and after any exercise/physical activity.