Mathcha is a nifty generator for inputting and sharing formulas and diagrams. You can export an image of your work like so:
![](https://jenniferrosenblatt.com/wp-content/uploads/2019/11/2019-11-12_19-24-04.png)
You can also export the LaTeX for reference, though it does not guarantee the accuracy.
![](https://jenniferrosenblatt.com/wp-content/uploads/2019/11/2019-11-12_19-24-33.png)
This can be a helpful way to learn LaTex as you go.