Using commas generally is about being logical. Don’t leave them out when needed; don’t add them when not needed. Learn to know what a basic sentence unit is.
An exercise about when to add a series commas. Lists of words and phrases are easy. List of clauses can be more difficult to see.
If you have a list of 3 or more items, be they words, phrases, or clauses, separate them all with commas. This is the series comma.
At times commas are simply wrong and must be avoided. They halt the flow of basic units in sentences.
Some parts of a sentence are essential for understanding. Knowing which elements are essential will safeguard isolating basics sentence units with commas.
Trying the understand nonessential commas. The best way is to practice.
Nonessential comma usage always leads to disagreement. Understand the basics and then go with your intuition.
To understand introductory commas, one must practice. Just a few sentences to get you going.
Introductory commas are generally easy to see provided you understand what introductory elements looks like. Examples: names, interjections, common intro words
Once you understand the concepts for using the coordinate comma, it is time to practice using the comma.
Understanding the coordinate comma rules means understanding terms like coordinate conjunction, compound sentence, compound predicate, run-on/fused sentence
Once one understands the logic of when not to use a comma, practice is needed.
When three or more ideas are strung together and a comma splice occurs, try and simplify the sentences.
Comma splice errors happen easily. Knowing the options to correct them is the trick to improving.
Understanding commas rules is as much about understanding comma errors and understanding the basics of a sentence.
A simple list of suggested comma usages. Not in any particular order and by means comprehensive.
Undestanding the sentence unit and the need not to disrupt it, helps focus when to use commas.
Grammar difficulties are many. So the more help available out on the web, the better.