Firstly, welcome to the forums.
While we are primarily here to help people with their Free Code Camp progress, we are open to people on other paths, too. Some of what you are asking is pretty trivial in the Free Code Camp context, so you might find that if you’re not getting the instruction and material you need in your current studies, the FCC curriculum will really help you get started. At a modest guess I’d say investing a 4-5 hours working through the curriculum here will really pay off. You can find the curriculum at https://www.freecodecamp.org/learn.
With your current questions, we don’t have enough context to know what you already know or don’t know, so it is impossible to guide you without just telling you the answer (which we won’t do).
It is pretty typical on here for people to share a codepen / repl.it / jsfiddle example of what they have tried so that anyone helping has more of an idea of what help is actually helpful.
Please provide some example of what you’ve tried and I’m sure you’ll get more help.
Thanks for being honest that this is your homework. You say you need help but it sounds like you actually want us to do it for you. As a general piece of advice, you aren’t doing yourself any favours. You need to put in the effort to try and figure out things for yourself. If we do this homework for you, then you have learnt nothing (except how to cheat). When you eventually come to try and get work as a developer you will be out of your depth. Jeremy has already given you great advice but just to add, if you have tried this on your own then posting a specific problem and your code so far would likely yield a good response.