Hi Nicholas and welcome to Sonic Pi
It is an incredibly flexible program, and can cater for both those who like programming but know little about music, and those who come from a musical background, but have not done much programming before. Sam’s philopsophy in developing it was only to include things that a nine or ten year old could understand, (although some users, incorporate complex algorithms which is also possible).
The starting point is however that sounds can be high or low, and this is governed by a number in the range 1-127, such that a higher number gives a higher sounding note, than a lower one which does the opposite. Notes can sound for different lengths of time, and there can be gaps between them when the program sleeps and produces no sound. Starting with these simple ideas you can develop tunes and play them. The sounds are generated by synths, which have different characteristics: some sounding smooth and mellow, others harsh and more grating. You can choose to taste. Add to this mix the ability to play prerecorded samples, which can be of musical instruments, durms, cymbals, or even dogs barking, and you have a rich mix of possibilites.
Nothing is “wrong” to try out with Sonic Pi. You can experiment to find what sounds nice to you. Do that and you are making music.
In order to guide you, there is an extensive tutorial built in to Sonic Pi which you can access from the Help Button. There are six tabs containing
Some Example programs to try out
Details of the available synths
Details of effects (fx) such as reverb and filters which can be used to modify sounds
Details of the included recorded samples
A language syntax section which details individual commands that Sonic Pi understands
There is also an external tutorial which I can highly recommend by MeHackit which you can access here
The best thing to do is to experiment and try things out using these various sources of help.
And there are lots of Sonic Pi enthusiasts on this site who will be willing to help and give advice along the way.
The main thing is have a lot of fun, and enjoy trying out Sonic Pi.