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The simple answer is that you're charged for every hour your RDS instance is running, and (broadly) not how much you actually use it. There may be some small charges for large volumes of queries, but keeping the instance running is the main cost.
However if you're a new customer you can have a small RDS instance free for a year. Look for 'free-tier eligible' on the management console.
AWS has detailed pricing category for different DB which should be clear enough. Taking mysql "On-Demand DB Instances" as an example, it charges based on the type and duration, however for RDS T3 DB instances which uses unlimited mode it may involve extra fees if your average CPU usage exceed baseline.
I created a new DB, and set up for Standard, tried Aurora MySQL, and MySQL, etc. Somehow Aurora is cheaper than reg. MySQL.
When I do the drop down option for Instance size, t3.medium is the lowest. I've tried playing around with different settings and I'm very confused. Does anyone know a very cheap set up. I'm doing a project to become more familiar with RDS, etc.
Thank you