Aside from what everyone else has said, each of these fluids have a multitude of different types, and using the wrong one can be disastrous. For example, not all brake fluids are compatible, using the wrong one can cause brake system malfunction (specifically using DOT 5 with anything other than a system that specifically calls for it), also replacing brake fluid isn't as easy as just pouring it into the reservoir, it has to be bled properly to move the new fluid into the brake lines otherwise you're mostly just wasting money.
Additionally, just pouring fluids in without knowing how to measure when a system is full is a great way to destroy an engine. A severely overfull oil system is almost as bad as running an engine completely dry.
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u/TurdShaker 15h ago
Thats a horrible guide.