So this is really completely up to you in a way; you can use and record whatever you’d like!
What I usually try to do is imagine the final result in my head, and then try to divide that into pieces I can record of look for in a library. Sometimes if I’m not sure what to use but just have a certain type of sound in mind (like a heavy object being pushed), I’ll go around and look for things nearby that might make the appropriate sound. For a heavy object, I’d probably suggest looking for a deep, grinding sound (pushing something heavy through dirt, or a scraping sound against a hard floor), and then maybe a higher-pitched, more “detailed” layer like sand or pebbles grinding; combined together you can get a pretty good effect.
Also, keep in mind you can adjust pitch to make something sound heavier - if you find an interesting sound but it doesn’t feel heavy enough, you can maybe make the pitch lower, and combine it with a few other things.
If you’re having trouble coming up with ideas, you can also try taking a short video (from a movie, video game, etc.) and try replacing or creating new sounds to go with the picture - sometimes having a video to work from can help you come up with ideas too.