>>2257665You can use several different services to build your portfolio. Behance, deviantart, artstation and many others IIRC grant you that functionality. Some might be a free service but you pay for more customization and your own domain name.
You can use tumblr to build one, change the domain name to one you purchase if you want it to look professional, pick an appropriate theme, and disable the visibility of comments, notes, share buttons, etc.
One of the more professional looking solutions is to just build the site on your own. Places like squarespace allow you to do it very easily with premade templates that are built to serve as portfolios.
Just do some research. Google the above services and the word "portfolio" to see what they offer. Google "best portfolio building sites". See what other artists are using for their portfolios. If they're custom made, does it look like something you could build using one of those services? If the browser has that dark gray cube next to the site name, then it was built in squarespace.