I have a left knee problem I walked up a very , very steep

You are most likely having what is called as bursitis which is inflammation of the fluid filled sac that surrounds the knee.

To ease pain and discomfort of knee bursitis, try these home remedies.

Rest your knee. Discontinue the activity that causes knee bursitis and avoid movements that worsen your pain.
Apply ice. Apply an ice pack to your knee for 20 minutes at a time several times a day until the pain goes away and your knee no longer feels warm to the touch.
Apply compression. Use of a compressive wrap or knee sleeve can help to reduce swelling.
Elevate your knee. Elevate your knee by propping up your legs on pillows. This can help reduce swelling in your knee.

Corticosteroid injection. If the bursitis is persistent and not responding to basic treatments injecting a corticosteroid drug directly into an affected bursa to reduce inflammation helps a lot.

Meanwhile you can also take OTC anti-inflammatory medications like motrin or aleve for a few days to help with the pain and inflammation.

Let me know if you have more questions.

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Kindest regards