Add instructions on checking link previews

README.md

@@ -27,6 +27,7 @@ Need help setting it up? Please schedule a call with me [here](https://cal.com/r
 ## Notes
 
 - If you're using VS Code, I recommend installing the [Astro extension](https://marketplace.visualstudio.com/items?itemName=astro-build.astro-vscode) to get IntelliSense, syntax highlighting, and other features.
+- When people share the link to your project on social media, it will often appear as a "link preview" based on the title, description, thumbnail, and favicon you configured. Double check that these previews look right using [this tool](https://linkpreview.xyz/).
 - The Nerfies page uses the Google Sans font, which is licensed by Google, so unfortunately, I had to change it to a different font instead (I picked Noto Sans).
 
 ## Credits