Oct 18-25 weekly update

Sorry for not updating anything lately, My right hand has some issues that make it so painful I cannot type or write. My hand is recovered now and I can type again :D. I know I promise the tutorials, what I will do right now is to discuss the concept of each question of a3. However, if you are looking for solutions,  then I suggest you leave right now, don't waste your time, I'm not going to write any answers for it. All I am going to do is to discuss the concept(as what I understand the question). Starting next post, thank you taking your time to read it.