A lot of people have difficulties with putting commas in the sentences. English rules, comparing to other languages (especially Slavic) are not that strict. Yet, there are some that everybody has to know
1️⃣ INDEPENDENT CLAUSES
The rule is easy - FANBOYS. These are coordinating conjunctions before which there had to be a comma. F (for) A (and) N (nor) B (but) O (or) Y (yet) S (so).
🦉It was raining, so I took an umbrella.
2️⃣ INTRODUCTORY CLAUSE OR PHRASE
Introductory clauses or phrases are usually longer than 4 words. They often include such words as AFTER, WHILE, WHEN, ALTHOUGH, AS, IF, SINCE, BECAUSE
🦉If you are sick, you have to see a doctor.
Sometimes an introductory phrase may be an infinitive phrase or absolute phrase
🦉To cook a soup, you need to have some meat.
Also there are some introductory words: YES, HOWEVER, WELL
🦉Well, I guess he didn't mean it.
3️⃣ BETWEEN ITEMS IN A SERIES
Here it's easy: use a comma to separate the items. Don't forget about the Oxford c