If the author of this thread wants to defeat ignorance it is proposed to organize courses of English language tuition on Skype for example. The error indicators will not make sense without training. Practice is the communication forum.
I don't want to defeat ignorance, because these mistakes aren't made out of ignorance, they are made unintentionally. There are a lot of these "tutoring/training" courses, especially for English, do you see them help any?
an error made more by native speakers is write loose instead of lose
why?
To be honest, I don't know why they make such mistakes. However, I guess it's because of sound. The 'o' letter in 'Lose' is pronounced a long o (oo), thus people mistake it for 'loose'. And the problem is: it's hard to change their mind.
almost all your mistakes are easily corrected with a spell checker, like most browsers already have if your OS is in english
and the a/an rule is confusing
is a strategy or an strategy correct?
Not all are corrected by a spell checker logical mistakes like it's and its, or your and you're would seem correctly written for a spell checker, therefore, they are the commonly mistaken ones even if one is using a spell checker. By the way, all languages, nationalities, and countries are written with an initial uppercase letter, hence, it should be English.
Can you tell me why it is confusing?
You should approach it like this:
Word: Strategy.
First/initial letter: S, hence, a consonant letter.
Article: a
This should take less than a second in your mind to write.
I constantly forget to put punctuation marks and from this it becomes hard to read. I'm not sure that my written one will be able to understand.