We can track to see the column changes for the modified item, leverage the send an http SharePoint action to get previous values of item based on previous version & also leverage the "Get changes for an item or file" action to get the information of which columns have changed. Video will have something for everyone from beginners to advanced users. Trying the CRAWL, WALK, RUN & SPRINT technique in this video.
https://github.com/rdorrani/Microsoft-Flow/tree/master/ColumnChanges