Going by your comments, I think you need to know a few basics before you get into people’s suggestions for actual services. Start with this: more or less, “the cloud” is just someone else’s computer. It’s bigger, the connection is faster, etc., but the services you use most likely run on a Linux computer much like the one you already have.

For experimenting with the topic, it would be good to have another computer that you can mess around with and not worry about having a usable machine. If you can cobble together a desktop from old parts it will be enough to start the learning process.