Set up your camera so you can take the same shot over and over again.
An indoors still life or a landscape might be good subjects.
Take lots of photos using all the adjustments you can.
Deliberately take pictures which are under- or over-exposed, learn to read how they appear on your rear LCD screen.
Learn how much adjustment is required to go from great, to OK, to poor.
You may want to refer to your camera manual to make sure you understand how to use the various camera controls