Use a comma before 'and' when it merges two sentences into one. Do not use a comma before 'and' in a list of two. Only use a comma in a list of three or more if your region uses the serial comma.
When and How to Use a Comma Before and After “But”
Comma Before While: Putting an End to the Confusion - ESLBUZZ
Don't always use a comma before “and”; here's when you do
An Easy Guide to Using a Comma Before And – INK Blog
When to Use A Comma Before And?
Do You Need a Comma Before 'But'?
Do you know how to use comma in a sentence? Here are some of the
Do You Need a Comma Before or After 'Both'?
Does The Comma Come Before Or After The Word But
I don't really agree with this answer. Do you actually need a
comma before and?
When to Add a Comma Before 'AND
BITE-SIZE GRAMMAR #1 – WHEN TO USE COMMA BEFORE 'SO' – NO BULLSHIT
