free way to make a qr code that links to my website?

Chrome on a computer does it already. Open your website, click the share icon in the address bar (or three dots > Cast, save and share) and pick Create QR code, then download it. Be careful with the free generator sites. A lot of them make a "dynamic" code that goes through their own redirect, and then the code stops working after a trial or unless you pay. A plain static code just has your web address in it and works forever.