IBM has different courses such as AI, ML, Deep Learning, Data.
You can start with a 1 hour course where they explain the basic AI concepts to help you understand from the basics. Happy learning! :)
PS: You just need to create an IBM account.
https://www.ibm.com/services/learning/ites.wss/zz-en?pageType=page&c=ZAOBIUFZBM2RQD4U