Recently started using WordPress and since I work in an hotel my boss is intrested in me making him a new website, the one thing I dont understand is, since he has a website already right now where do I build the website before changing the one he has right now with mine? (I want to completely build first so his website has no downtime). in a local installation of wordpress? but I work 50% from my desktop and 50% from my macbook so the local installation wouldnt be the best solution for me. Or I should buy a test domain to build website there?
I tried to search online and on reddit but I couldnt find the answer.