there isn’t enough space in my home folder

WilliamO1234 wrote:

My Mail will not open because there isn’t enough space in myr home folder

How to free up storage space on your Mac - Apple Support

Free up storage space on your Mac - Apple Support

The files that you have control over are located in the Documents, Downloads, Pictures, Music and Movies folders.  You can use this free app, GrandPerspective to find the largest files on your drive so you can determine if they can be deleted or moved to an external HD for storage.  

This 250 GB mini portable external SSD would be a good choice to store your excess files on: 250GB OWC Envoy Pro mini.

Note: you can empty the Downloads folder after the apps and/or updates that were downloaded have been installed or applied.  Many users have found a couple of Gigabytes of files in their Downloads folder which are no longer needed.