Fixing my credit help please

I got a secure credit card to help me build credit but everyone who I tried getting help with to help me don’t ever know anything so I am lost

I got a secure credit card limit is $500

The due date is every 26th of each month I heard different things about helping my credit go up I been told to just pay the minimum payment of $20 each month. Then I heard pay the full balance owed by the 26th of each month this will help my credit go up.

What is the best way to help your credit go up? By paying it in full by the due date or paying the minimum payment.

I also put myself on payments starting this month for all my collections for medical i have 4 accounts with the same medical agency I will be paying $400 each month for 6 months and then if I have money to settle the test I can or I can set another payment plan.

I want my credit to be good and go up I am trying my best to resolve all my debt but I feel so lost 😞