Can I ask two questions about this, please?

I seem to remember that you were supposed to put a little line above the "m" letter when I did this at school. But it was not in the examples when I refreshed my skills last year. I assumed that I remembered it wrong. But now I noticed that OceanEyes had used it in her example. How should this be done??

Is there a little "bump" before the letter "ж" in cursive? (seems like it, from Ramil's correction) I thought it was not needed for "ж"?