UiPath Studio and StudioX are development environments for creating automations, but they target different user groups.
Studio is for more experienced, technical users, while StudioX is designed for business users and citizen developers who may not have programming backgrounds.
UiPath Automation Cloud is a platform that enables businesses to build, manage, and deploy automations in the cloud.
Also below docs should provide more clarity
Once you have gained some clarity what these different products do, then you can accordingly do a free training for same on UiPath academy.