A little info...
Welcome. On this site you can find a wide range of options for using whiteboards (sharing possible). If you use Excalidraw (you should!) beware that the board resets on exit. Please take care to save your work (export as excalidraw file). This can easily be opened on next use.
When using Excalidraw, three functions are important to know:
1. Save (export) your work!
2. Open previous saved work from downloaded files
3. Live collaboration
or
2. Send shared link to partner(s)
3. Join a shared board
Any and all partners can type in the shared link in the box and click "Submit".