Uses of a comma and full stop and their examples?

Comma:
1. To separate items in a list: I need to buy apples, bananas, and oranges.
2. To separate independent clauses in a compound sentence: I went to the store, and I bought some milk.
3. To set off introductory phrases or clauses: After work, I went to the gym.
4. To separate adjectives that describe the same noun: She is a smart, talented woman.

Full stop (period):
1. To end a sentence: I am going to the store.
2. To indicate an abbreviation: Dr. Smith will see you now.
3. To separate elements in a list when not using commas: I need to buy milk. Bread. Eggs.

Comma (,)

- Separate items in a list:
- Example: We need milk, eggs, bread, and cheese.

- Set off introductory clauses and phrases:
- Example: Although it was raining, we had a picnic.

- Separate clauses connected by coordinating conjunctions (and, but, or, nor, for, so, yet):
- Example: It was a beautiful day, so we went for a walk.

- Set off nonrestrictive clauses and phrases:
- Example: My friend Sarah, who loves to read, is visiting me.

- Separate direct addresses:
- Example: Can you help me with this, John?

- Set off parenthetical expressions:
- Example: The book, which was very old, was falling apart.

- Separate decimal parts of numbers:
- Example: The population is approximately 1,000,000.

Full Stop (.)

- End a sentence:
- Example: The sun was setting.

- End an abbreviation:
- Example: Dr. Smith
- End a list of items:
- Example: Groceries: milk, eggs, bread, cheese.

- End a command:
- Example: Please close the door.

- End a polite request:
- Example: Could you pass the salt, please?