Buying marketplace health insurance tax credit confusing MD

A very general question, the relevant image is attached. I am recently unemployed and trying to do Maryland's state insurance and only earned about 5k this year before quitting in mid January, so I qualify for this plan after entering a lot of confusing info.
Can anyone tell me what this means, I really have no idea. What does the slider of the premium tax credit mean? Does that mean I have to pay back the tax credit used to lower my monthly premium eventually? Or is it given to me? Do I ever compensate for using or not using? I am trying to go to doctor's visit and mental health appointments at the lowest cost and thought applying for maryland health connection would be useful. Thank you in advance.

https://preview.redd.it/buying-marketplace-health-insurance-tax-credit-confusing-md-v0-gxb1l4hduwtc1.png?width=1272&format=png&auto=webp&s=73016ed88d092d70ab31f8de99d0100e70bd674e

submitted by /u/WhatsTheOcasion
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