Although the 26 points are fairly good to follow, how people communicate their ideas depends on more factors than what's clamsily said there. With all due respect, there are formal and informal ways to share messages either orally or in a written way, and then there are so many issues you have addressed, in my opinion, wrong for a purpose to debate it. Well, I am sorry, if I am using my commas or conjunctions incorrectly.

1. Don't use abbrev.
2. Proofread carefully to see if you any words out.
3. Don’t use question marks inappropriately?
4. Excessive use of exclamation points can be disastrous!!!!!!!!!
5. Never use that totally cool, radically groovy, out-of-date slang.
6. Profanity sucks.
7. Be more or less specific.
8. Placing a comma between subject and predicate, is not correct.
9. Don’t repeat yourself, or say again what you have said before.
10. Hopefully, you will use words correctly, irregardless of how others use them.
11. Note: People just can't stomach too much use of the colon.
12. About sentence fragments.
13. Each pronoun agrees with their antecedent.
14. Just between you and I, case is important.
15. Don't use commas, that aren't necessary.
16. Only Proper Nouns should be capitalized. also a sentence should.
17. begin with a capital and end with a period
18. In letters compositions reports and things like that we use commas to keep a string of items apart.
19. Verbs has to agree with their subjects.
20. A writer mustn't shift your point of view.
21. Don't write a run-on sentence you've got to punctuate it.
22. Never use a preposition to end a sentence with.
23. Avoid clichés like the plague.
24. And don't start a sentence with a conjunction.
25. Its important to use apostrophe's right.
26. It's better not to unnecessarily split an infinitive