Hello
I am a student (management and ...)
For my project of end of study I would like to present to even initiate a digital/local/startup whose nucleus would be the Block chain.
Idea 1: a system of notatization with backup or not for docsdocs ... With C2C service and B2C/B one even a government to Citizen service...
Idea 2: a "meal voucher" project ... I let you develop because the stakes and constraints seem obvious to me ...
Your comments ?
Any advice for the platform that I have to use? BTC, Eth, Ada and why not XLM ...)

You could easily go only with btc and include other coins by the shapeshift API. would be hard to develop the full engine for each coin, is better if you do it with only one and grab a tool to invoke the other ones.
The project sound nice, i would suggest a bus payment system, that would be a nice tool for the community.