Copying mesh, bringing into different project

I bet this has been asked before but this webpage keeps timing out everytime I try to search,

How do I copy a mesh from one project and bring it into another project?

Thanks so much.

File, Append/Link
Search for you old file.
Then you have to select from a few categories.
It’s a bit daunting the first time, so don’t get scared and back out.
Just think for a moment.