A throw without a catch is a turn (the other team gets the disc). In order to score a goal you need to catch the disc. If you want to advance down field you need to be able to catch the disc. Sometimes on defense you’ll want to intercept the disc. How do you effectively catch?
Use both hands!
Really, that’s the easiest way to catch a disc. When trying to catch the disc, always use both hands when possible. One handed catches should be rare if at all. The safest way to catch is the Pancake Catch.