Random question, is it legal to use a template or stuff from templates (from the figma community) for your client's website design?

Hey everyone, what is a good way to learn how to develop a site in webflow with relume components? Right now I make decent designs with the relume kit in figma and my friend codes it with html (css/tailwind) by using the dev mode in figma. We want to start using webflow because it seems useful(and basically whole relume is based on it) and right now a lot of time goes into making a website responsive for different devices. Is there someone who could help us out? thanks in advance :)

What is the easiest way to change the colour of all relume components and all the text colour in the premium figma kit? so you don't have to do it manually...

Is webflow a necessary tool if you want to use Relume? And how do I make responsive designs that suit every device?

Do you actually need webflow? or is Figma enough to design your project and let your developer use dev mode?