Please provide the Suggestion which one need to learn Iaas paas Saas as a Net develpoer

Question

i have worked on .Net for 4 years now i would like to learn Microsoft Azure and devops, so could you please provide suggestion for my career growth. 1)which one correct iaas, paas, saas .2)do you want to me learn the Dev ops also? 3)which skills are required i mean C#/Python adn request to provide the series. if you could do this it would be great help for me.

Thanks