Before learning how to use a lawn edger, it is important to take the time to choose the right one for your needs. To help you find a good one, you could talk with your neighbors to see which lawn edger they prefer to use and why or a home improvement store on which edger is best for your needs. I suggest you take the time to do your research and compare before settling on just any edger. Especially since your neighbor’s yard may have different needs than yours does and your preferences for different features will most likely differ from theirs.
Once you settle on a specific model, you can try looking up some videos on YouTube to learn how to use it or you can look up articles and forums for tips and advice from other users. Your local home improvement store should be able to help as well. They are not overly complicated but any newbie users may need some time to get the hang of it. If your neighbor uses one, you can have them show you as well. For details: https://toolsaroundthehouse.com/garden/best-lawn-edger/