In today's generation and technology, there are a lot of ways on how you can share about bitcoin,

You can simply:
-talk it with your family and friends
-share videos about bitcoin
-post it in your social media account
-or the best and most effective way is to show them results.

These are only few of the many ways on how you can share your knowledge about bitcoin. Oh! one last thing
You can also use this forum to help existing bitcoin users to widen their idea about bitcoin. How about you guys??