Beginners doubts...themes and mysqli

Good afternoon, first of all thanks to those who help me, I’ve been reading about ionic for a long time and I can’t get myself to start developing…

First of all, I am concerned about aesthetics, I am a weird developer and aesthetics worries me a lot, how can I see themes or create themes? Only the components found on the web exist?

Another question, taking advantage of ionic’s web capabilities, I want to make an app connected to a mysqli server, is this possible? some example?

Thank you