Will you make a code review of the layout?

Question

code review

Good day. In general, with self-study, there is one problem - there is no one to shake hands when you do something completely wrong. So I'm asking you to point out the mistakes.
Link to the code: Github
Poke the site: Github pages
There is some navigation on the site, but for convenience, direct links to all pages: 1 , 2 , 3 , 4 , 5 , 6
Instead of connecting stable and proven plugins, I wrote my non-bicycles solely for the practice of JS. Please do not comment on the design of the desktop version, as it is not mine, it is just a template from the net. When you open the site, you will be asked to access your location, so I just send your geo-coordinates to the Google maps API to determine the country, and hence the currency. Most likely you will not give access, and you will do it right. I understand that this most likely needs to be cut out, but I was just interested in doing something like that.
Look like that's it. Thank you all in advance.