Some criticism: This section focuses too much on what the particles aren't and not enough on what they are. The comment along the lines of 「が」 referring to a subject without existing context and 「は」 referring to one existing in context was especially helpful information. But just reading the article I had no way of determining how, when, and why to use each particle. But going to another tutorial doesn't help, because they generally explain things in terms of English grammar, calling them "nominative and accusative markers" and other silliness.
Some criticism: This section
Some criticism: This section focuses too much on what the particles aren't and not enough on what they are. The comment along the lines of 「が」 referring to a subject without existing context and 「は」 referring to one existing in context was especially helpful information. But just reading the article I had no way of determining how, when, and why to use each particle. But going to another tutorial doesn't help, because they generally explain things in terms of English grammar, calling them "nominative and accusative markers" and other silliness.