DAW software is probably the most complex application you will come across. No other has so many options and has to work with so many third-party plugins and instruments, all the while trying to manage multiple audio streams in ‘real-time’.
I recommend that you think about allowing yourself six months to be able to learn enough functions to get the sort of recordings you would like. You will not be an expert, and you may never ever get to use all the available functionality.
Aim to develop a basic set of workflows for recording, mixing and managing your projects, to which you can add or modify as you learn more.
Read through the intros of all the chapters in the Operation Manual so you know what Cubase is capable of, because if you don’t you risk missing out on using very useful capabilities for which you needed more experience before you would really appreciate them. Then learn the details ‘just-in-time’ as you require them.
And don’t be afraid to ask us more questions, but do as much of your own due diligence first.
Don’t be afraid of making mistakes, because it is often through understanding why they were mistakes that we really know what we are doing, as opposed to parroting a set of instructions, which would require an Op Manual many times larger to fully cover all the operational permutations.
If things suddenly don’t work when they have before, slowly and methodically check every control in the signal path from input to output, forward and backward, to make sure you haven’t inadvertently changed anything.