What are the best websites for making your own [business] website?

I’m making a website for someone’s business, and I would like to know the best websites for making your own site. If anyone knows from sites that you have pay for or if they are free, I don’t care which and actually having both options would be great. Thanks a lot.

What are the best websites to post requests for work as freelancer in building simulation/eQUEST?

What are the best websites are to post requests for work as freelancer in building simulation, specializing in eQUEST? I mainly work with architects and HVAC engineers.

Also, are there sites that I could search to find posted jobs in this field? Thanks.