Multiple questions about OLM dates, Statuses and Tables in R12

Multiple questions about OLM dates, Statuses and Tables 1) How to identify how may employees enrolled in particular course and certification as of sysdate 2) How to identify how many employees enrolled in course and subscribed to learning certification as of sysdate 3) Is there any query which can shows that how many employees actually started playing course and learning certification as of sysdate. 4) How to identify the e learning course status ? any table/column 5) How to identify how many employees completed the e learning course and completed the certification, is there any difference between certification completed and certified status if yes what is tha