[As an experienced Local Guide, I now sometimes come across inconsistencies or notice that errors have been made that I used to make myself when I started out. So I am now publishing a few 'best practice' posts, in the hope it can help others.]
Sometimes you come across a point of interest where several pieces of information are missing or wrong. Then you click 'Suggest an edit', make all the changes and click 'Submit', right? Well, my advice is not to do this in all cases, but instead submit the changes one by one. Admittedly, it's a few extra clicks, but I have experienced that if you submit several changes at the same time and for some or other reason one of the suggested changes is not applied, none of the changes get applied.
And for those who are eager to score as much local guide points as possible there is another reason as well: the counter that shows you how many points you have earned always only counts to 5 when clicking submit, no matter how many suggested changes you submitted - just one single or 2, 3 or 4. Compare this to what happens when you post a review for a point of interest: the counter then does produce a different result if you submit a review that is over 200 characters long, as it takes into account the 10 extra points for a long review. So, my interpretation is that 'Suggest an edit' brings 5 point per time you run the module, not always 5 points per changed piece of information - unless you submit them one by one.
One final remark: people with bad intentions (spammers, drug dealers creating POIs on Google Maps to publish places where they are selling - not a random example, there are documented cases) also sometimes use this method, so the Google algorithm might interpret it as a 'suspicious move'.