You can show your products to anyone by removing your password. You can remove your password anytime from your dashboard. Your store will always have a '.myshopify.com' extension as long as you don't add your custom domain and you can share this address with anyone. Do remember, you need to buy a Shopify plan in order to start transactions.
Secondly, Shopify gives you a trial period of 2 weeks (14 days). Post that you need to buy one of their plans. Else none of the things written above will happen.
All the very best for your store!
I would request you to visit our website once. If you feel we can help you with anything, feel free to reach out to us anytime. My team will be more than happy to help you transform your initiative into a successful business.
Hope it helped you @NadiaKat
Marketing Officer, Descrii
Visit our website- https://descrii.tech/
Find us on Shopify Store- https://apps.shopify.com/descrii-smart-descriptions