For those of you starting out on your network automation journey, then this is for you. The great guys at Juniper have released a set of free network automation labs at https://labs.networkreliability.engineering/.
As they state,
NRE Labs is a no-strings-attached, community-centered initiative to bring the skills of automation within reach for everyone. Through short, simple exercises, all right here in the browser, you can learn the tools, skills, and processes that will put you on the path to becoming a Network Reliability Engineer.