I will only address your last comment here.
Grammar and formatting matter. It is important that you recognize this site not only as a place to learn physics, but also (primarily?) as a place to learn to communicate physics. It is not enough to have it clear in your own head, and you also need to communicate it correctly. An answer that has serious grammar issues can be so hard to read that it is simply easier to give up, and particularly so for the parts of your audience that do not speak fluent English.
Formatting can also be harmful to an answer to the
point of rendering it unreadable. Answers which have unadjusted para-
graph lengths which have
you chasing the line all over the place are very tiring to read and will often cause downvotes simply in self-defense. It is important that
each paragraph contain one point and one point only and that it be visually
separated from the
other paragraphs.
The Stack Exchange text editor was built by web designers who have thought about such things for a long time. Let the editor do its job! Do not hijack its formatting like I did above. Enter each paragraph in a single go, without any unnecessary line breaks (which is essentially only equations), and leave an empty line in the text editor between different paragraphs. Finally, always use displayed equations (double dollar signs) whenever an equation deserves it own line. Isn't this a lot easier to read than the above?
I should also note that threatening to downvote other posts is not as constructive as, say, asking for help as to how to better format your material. So you have found other posts with grammar and spelling mistakes? Good! Go and edit them so that they are better and easier for everyone to read.
(As a counter-argument, you may ask why people don't edit your posts for spelling and formatting. There may be many reasons for that. One is that you do seem to have gone to extra lengths to make your formatting hard to read, and it is sometimes felt as unpolite to go and undo your work, even if it is completely in the wrong direction. Another reason is that sometimes the edits would be too minor and would not merit bumping the thread up. Finally, when the edits are major enough to merit that, they usually render the answer essentially impossible to understand and they would make for an unreasonable amount of work.)
As a final note, let me say that it is important to not take down-votes personally. Because any question or answer always takes in some amount of work, a downvote always tends to sting; this happens to everyone. However, when people downvote, it is as an indication that the post is not useful, as the tooltip says. If you get a downvote, take it as an invitation to reconsider the physics content of your post, and to make sure that the presentation is optimal for transmitting said content to people who do not know it.
