1

Tags.

2

You could structure your folder by file type, audience, topic, reference code, or any other structure that is useful for you.

3

Yes.

4

Your site administrator.

1

You can use your journal for both of these purposes, and more. You may also want to use it to record simple factual information at certain times. For example, you could bullet-point a few key learning points following each lesson in your journal. These can then be used as part of a revision program for an exam.

2

You can attach images and other files to your journal post.