Try to avoid putting strain on the foot and heel as much as possible. Especially in the beginning stages of a heel spur or plantar fasciitis this is very important. Too much strain is one of the main factors contributing to a developing heelspur. Especially fanatic sporters should take it easy, which can be very hard ofcourse, but keep in mind that a heelspur can potentially put and end to your sport if you allow to let it become chronically.....
Depending on how serious the injury is, some light form of exercise may be beneficial, but is is best to discuss this with your doctor.
If you still want to keep exercising and keep in shape, you may switch to sports that do not put strain on your feet too much, like cycling or swimming. Still, beware on any strain: Cycling fanatically will put strain on the fascia again. Adjusting the pedals can be wise here.
Also persons with professions that require you to stand still on your feet a lot are vulnerable. Again here: try to avoid this, though your boss may not always agree....
Also excessive weight should be avoided..
Don't walk on bare feet!
Walking on bare feet is very stressfull for the heel spur. Even if you just need to walk a few meters to the toilet at night you should put on shoes or slippers, plus even do a few stretches. Due to the feet being static for a few hours, these first few meters are very stressfull. You might even warm them up with a few stretches before you get up (check our article on stretching for this).
Note that this advice is especially true for hard surfaces, like the ones you typically find indoors. On soft undergrounds, the opposite may be true. On soft sand or thick grass the foot is cushioned, but also a more natural way of walking is induced. This may even help to heal if you try to do so regularly.