Website Design - What is it ?
A not-quite-so-simple answer:
Once-upon-a-time, Website Design was something that could almost be done with a good Word Processing package - such as MS Word.
There were also slightly more sophisticated packages such as Serif Web Plus and Net Objects Fusion.
Sadly, while fairly easy to use if you were used to graphic-design software, they only really produced "Static" websites which did not work so well on the many different sizes of screens that today's more modern sites have to cope with - and without that ability to react to the screen-size, Google and other search engines will downgrade your search results and rankings.
At Weboriel, we currently make use of various "Adobe" CC software suites to help design our sites, but there is no hard and fast rule about which is "best" - "Best" is whatever gets your site near the top of Google listings in the search categories you are most looking for and encourages your clients to do business with you.
If you ask us to design your new site for you, we will be using software from the Adobe suite to do so - Probably a combination of Photoshop, Dreamweaver, Muse - but it could include After Effects, Acrobat and many others, as they are all intended to integrate with each other (to a point).
If your budget is very tight - and / or you want to design your own site, we are happy to host it for you.
Whatever your needs, please ask and we will do what we can to help you.