Why? How does knowing how politics worked before I could vote, help me as a voter today?

I understand enough about politics to cast my vote and beyond the act of voting, I generally don't follow politics. I vote based on party platforms (what they intend to do) and the likelihood of those things happening. Eg, if a party was to say that they'll make everyone rich, I would consider that statement to be delusional, unrealistic and not something that could be fulfilled even if that party was voted in. This is an extreme example, but I think you get my meaning.

Beyond doing my due diligence in figuring out who I want to vote for, and then voting for that party.... What else do I realistically need?

My district always elects the same party anyways, whether I vote for them or not. I've landed in a gerrymandered location and that party basically always wins, but I still vote regardless.

IMO, I shouldn't need to take a political history course to be considered to be a responsible voter.