[Gimp-user] Resize image

[Cindy Schmidt <gracewarejewelry gmail com>]

I am a GIMP beginner....
1.When I crop a picture, what is the best way to resize? I have been using Image/scale image, then setting 
width and height at 4896 & 3264.
Is that best? Or how is best to help retain quality.
2. I have been using Filters/enhance/unsharp mask...is this best, rather than Sharpen? And do I leave the 
Radius/amount/threshold settings at what pops up?
Thank you for any help or advice..
.am having fun using GIMP...many thanks.
Cindy