hey guys i want to know if there is a difference in .wdl script and .c script? I only have the free version of 3dgs, and i can't run the .wdl script that i've downloaded. Is there any possible way so that i can use the .wdl script I have in a free version of 3dgs?

wdl is the old scripting language which is not compatible with the free Version of GS anymore. If you wanna use wdl though u have to upgrade to atleast Extra.
But i recommend using c-Scripts (lite-c).

... or you can try this .wdl script in trial mode.

but i'm getting started in 3dgs.. many resources or codes that I'm downloading mostly is .wdl script? Is there any possible way so that i can convert .wdl script in .c script?

Don't try to learn or to convert old wdl script, esp. when you're missing experience. It's probably not worth the trouble and lite-C offers way more features.
Where are you downloading your (wdl) resources?