You could actually have slightly different meanings in your two sentence examples. To "enjoy learning" implies that you have found a way to enjoy something that might otherwise be boring, and you found a way to make it more bearable. But to "have fun" means to do something that you enjoy doing at that moment ("for the fun of it"). So to "have fun" with Cikgu Ben language could mean you are using the language in a way that makes you and your friends laugh...perhaps pronouncing the words like a non-native speaker would, or speaking it like someone who is very poorly educated might, in order to make your friends laugh! No hard and fast rule how you need to use the expressions, though! So, learn to have fun by having fun with learning! :)

There are actually quite a few fun ways to learn. So in a lot of cases, you can do both at the same time.

all people like fun but for improving we need to learn ,i think both are necessary and complete each other