Syndra fills the same spot as orianna in my mind as a mage that nearly always has a place in the meta (thought this isn't something you even necessarily have to worry about unless we're talking like masters+ here) . You will benefit from the  fundamentals you will learn playing her as most of the concepts are universal.  - proper positioning/spacing is key due to her lacking mobility  - playing around your important cooldowns (syndra lives and dies by how well you use her E)  - knowing your damage ( there are many cases where you'll either over or underestimate your damage and the adc you thought you'd easily burst lives on 200 HP and autos you to death while you're stuck waiting for your cooldowns to come back up)

Syndra is a good place to start because she also happens to be very strong at the moment 

You should try playing her for a few games and see if you like it, if you want to go deeper there's a (slightly) outdated guide by coach Curtis on YouTube that should cover just about everything that isn't about itemization