Honestly, the most important thing I think freshmen can learn is that a thesis you write before doing research is just a throwaway sentence. You do the research, gather quotes, and then you write a thesis, and that doesn’t make the paper less self-directed or relevant; it just makes it something you have the ability to write as an undergrad.
If there’s something you want to write about, but all your sources say the opposite, you write about why your view of the thing was so different from the more usual one. You write the “this is what everyone thinks, and this is why they think it, and this view being the most popular one is invalidating to me and my lived experience” paper. You gather quotes you can argue with. Any good paper will put you in conversation with your source material, and sometimes that conversation is an argument.