Sentences, Fragments, and Run-ons

Available in different colors, such as red, yellow, green, blue, and purple.

At my school, we cannot write or highlight in our textbooks. What type of sentence is this?

I use small sticker flags to mark important passages I write notes on larger self-stick slips of paper.

A color-coded system for marking different types of information.

Occasionally a teacher will say, "This will be on the test."

Marking the page with a red sticker immediately.

What type of passage is indicated by red stickers?

Green is the color of growth I use green flags for difficult topics requiring extra study.

As a reminder of my own possible intellectual growth in this topic.

Blue, the color of smooth sailing.