We get this question a lot so we put together a short overview Introduction to Your Account to help you get started. You might also consider enrolling in the ArcGIS Online Fundamentals learning plan or visiting learn.arcgis.com for practical examples of how GIS technology is used everyday to solve challenging real world problems. Thanks for your question, please leave us a comment if the information we provided was helpful.
How do I log in to my ArcGIS Online account?
Tony Piaskowy Edited answer