Grammar

I am in the same boat as you are. But after taking a short grammar lesson online, I came up with below conclusion.

Shoveling is something THAT I dont like.

Here, thei nonessential clause after THAT does not tell you information about the subject before THAT. If it did, we would use THAT.

For ex:

Shoveling is something that requires you to pick up a shovel and dig snow.

Shoveling is something which will make you feel better
Shoveling is something that requires a snow and a shovel (stupid i know).
Shoveling is something which will make the driveway look good.


Rule 2 That introduces essential clauses while which introduces nonessential clauses.
Examples I do not trust editorials that claim racial differences in intelligence.
We would not know which editorials were being discussed without the that clause.
The editorial claiming racial differences in intelligence, which appeared in the Sunday newspaper, upset me.
The editorial is already identified. Therefore, which begins a nonessential clause.
NOTE Essential clauses do not have commas surrounding them while nonessential clauses do contain commas.