There are some very good resources online for using Markdown. We have created a simple deck to demonstrate how to use Markdown on your text input.
https://app.deckzero.com/deck/Markdown-Cheat-Sheet-MTQwMzk4MDA3MTY/
Other sources:
https://www.markdownguide.org/cheat-sheet/
https://github.com/adam-p/markdown-here/wiki/Markdown-Cheatsheet
https://guides.github.com/pdfs/markdown-cheatsheet-online.pdf
https://en.wikipedia.org/wiki/Markdown