Thank you for your reply.
We spend a lot of time explaining to users that a single word can and does constitute a sentence so we expect 'Thanks', 'Yes' and 'No' to be capitalised and, if they appear as a standalone sentence, then they should have a full stop at the end. Again, I can only say that I have great difficulty accepting the word 'yes' as a sentence. A real sentence has a subject and a predicate. Related to that, I see no reason that single words or phrases such as 'not a teacher' can't have a place as a piece of information within a post.
Also bear in mind that, as a native speaker, the learners on this forum will expect everything you write to be grammatically correct, spelt/spelled correctly, and capitalised and punctuated correctly. There are odd occasions when the native speakers disagree on how something should be written That should not be at all surprising, and learners eventually have to realize that there can be more than one acceptable way to write something. but, in the main, we all stick to the same 'rules'. This serves, above all, to avoid the learners getting very confused by seeing different systems and constructions employed by different native speakers. But at some point advanced learners have to realize that language is different than science is.
Whenever a new native speaker joins the forum, especially one who immediately starts to answer learners' questions, we spend quite some time perusing posts by that person to check their English. The moderators correct minor typos in each other's posts on a regular basis because we can easily tell what is a typo and what isn't. With new members, like you, we have to read posts to see the constructions and standards used. For example, in your fifth point above, you wrote "as apposed to". At this point, we don't know if that is a simple typo or if you don't know how to spell "opposed" correctly. That was some sort of misstep; I do know how to spell 'oppose' and its related words. I am happy that you found only one mistake. You can imagine that my main concentration was on deciding what I should say and how I should say it. I'll take only one mistake as a success.
Finally, in my previous post I forgot to address the issue of the rules concerning the use of a colon within a sentence. I may have previously mentioned that there is a massive amount of incorrect colon use on the internet, including on ESL sites and by people who should know better.
There are two requirements for the correct use of a colon within a sentence.
a) What comes before the colon must be an independent clause, in other words 'a grammatically-correct and complete sentence'.
b) What comes after the colon gives additional information about what came before the colon.
'During their walk near the river, they saw three kinds of animals: two pheasants, a fox, and a rabbit.'