Ignore behavior that is annoying but not harmful. Sometimes your baby won't be happy with the decisions you make, and will fuss. You may even be tempted to give in to baby. Keep in mind that limits are necessary for your child's safety and welfare. You can set limits while giving baby freedom to explore and to grow.
Children can be very different from each other.
Then you can encourage each new ability. I can crawl up stairs, too. But I may not be able to crawl back down yet. I stand for a little while if you hold my hand. I poke my fingers into holes and other interesting places.