How to do it correctly, I want to sell goods on the site, or is it necessary ...?

Good day.

You need to issue a FOP if you carry out business activities, that is regularly provide services or sell goods for the purpose of making a profit.

Selling goods on the website is a type of distance trade that is subject to registration as a business activity.

If you want to sell goods on the site, you need to open a sole proprietorship or LLC, choose the types of activities (CVEDs) and the taxation scheme.

Carrying out business activities, in your case - selling goods on the website, without state registration as a business entity is an administrative offense.

You may also be held criminally liable for tax evasion in large amounts ** (over UAH 1 million)