Its always busy here with the threads as previously mentioned; occasionally there is one here that causes me to rise to the bait.
Bottom lines are:
Specific bikes on Craigslist will be sold if they are good buys long before an indecisive poster can ever get enough advice to enable her to "pull the trigger".

Garages and basements are filled with unused bikes owned by people who thought buying a bike with more gears or lighter or from a "better" source would somehow magically flatten hills for them that their previous "heavy" bike could not.

Asking over and over again about this bike or that is not going to change the advice given early on to this poster and numerous others in the past. Get a little practice on your commute with your current bike "heavy" or not, gain a little experience, a bike afew pounds lighter is hardly going to make much difference on a commuter bike.

Advice on what to buy from strangers is going to be all over the map and more than likely make a purchase more difficult for an indecisive person. No bike will be "ultimate" or "perfect" enough, especially on a rock bottom budget.