It is possible that you have not decided yet and still confused. Because I have been at the same spot a few years ago.
If you can write well then I will suggest you make a blog and share all your knowledge over there. Because people love to leave informative stuff.
In case, you do know how to make good videos, then I will suggest you Youtube. Make videos on youtube and share it on your website or blog too.
There is a new social site Instagram (Not new for someone though) Make short videos and share it on Instagram in IGTV. People now days prefer videos to learn rather than an article.
I hope it helps.