A local version of AWS
One of the things that has deterred me from doing much personally in the cloud has been the potential cost.
I joined A Cloud Guru for a year and was able to learn a lot doing some of their courses and using their emulator - thoroughly recommend them btw.
This week I came across LocalStack. This allows you to run an emulation of a lot of the AWS services locally on your machine. I've not tried it yet but plan to in the near future.