Openstack? How to make google drive?

Question

Cloud computing

Hello. I am a web developer. On my way I met quite a few different technologies and frameworks, I worked both with the front-end and with the back-end, I also happened to work with big data and machine learning, but never in my life there was a single project related to cloud storage development. Recently I was interested in this topic, but I ran into a problem - where to start digging? There is little on the Internet for requests for creating cloud systems. I would like to know how cloud storages are being developed, what technologies are used there? It would be nice to find some articles or literature that will explain the principles of development in general terms (English is also welcome). I need any useful information on this topic, thank you in advance to all who responded!)