Hey, this is a dumb question, but I can't remember. I'm a new welder still

However, I think I'm getting the hang of it. I'm picking up a new welder either this week or next week. A cheap but functional one.
If i wanted to weld, I'd attach the ground clamp to my welding table and i could then use clamps to hold down the metal and then just weld right? Now what would I get shocked by if i like touched the table or pieces. I can't remember.....and i don't meet my teacher again for like a week. Just can't remember. Sorrry, lol.