Jo selecting something and then press H is that to delete it or have i been doing something very very wrong? 
Deleting
Bobb
(Bobb)
#1
Shaderman
(Shaderman)
#3
You can (h)ide something with βhβ and unhide it with Shift + βhβ. Nothing is deleted. You may want to read help --> Shortcuts list to see which shortcuts are available in Radiant.