Disclaimer: I'm not a lawyer. For your second question, it's a matter of plagiarism. So you'll want to avoid outright copy/pasting the homework and material in

Disclaimer: I'm not a lawyer. For your second question, it's a matter of plagiarism. So you'll want to avoid outright copy/pasting the homework and material into your blog. However, you can state similar types of questions and provide an analysis on your answer and the steps / thought process you took to reach it. For example, if you were taking Calculus and were asked to solve for the derivative of 2x^5 in your homework, you can instead show how to solve 7x^3 which provides the same knowledge.