UiPath is the top tool and also the easiest tool to learn RPA because it does not need any prior knowledge of programming languages to use it and implement RPA. UiPath is also the best tool in terms of popularity and usability. It is the easiest and simplest RPA tool with drag and drop functionality for all activities.
I recommend this RPA Certification Course by Intellipaat to learn RPA.
Also, watch this video on RPA: