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 youβre 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 Iβd 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 donβt have enough context to know what you already know or donβt know, so it is impossible to guide you without just telling you the answer (which we wonβt 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 youβve tried and Iβm sure youβll get more help.