Politely, shouldn’t you know basic things before selling on Amazon. Otherwise, you will cause yourself all sorts of issues to come with returns, refunds, how to reply to Buyers, etc, etc

Try the Seller University. It shows the basics at least.

You can confirm shipment and leave blank, BUT, lots of Buyers do not like blank tracking and will ask Amazon and all they have to do is put in an A-Z Claim, and Amazon will refund all your money if no tracking shown. If the Buyer wins the A-Z Claim, that also counts against you and if not selling many items, that can close your Seller Account.

(look up A-Z Claims if you don’t know what they are, also how to find metrics about account health etc).

So, send with caution without tracking. In my opinion: Only send anything non-tracked, if your account can take several hits with loss or delay claims. If anyone queries if late, then just refund immediately, as if the Buyer asks Amazon, then they will refund from your money and count against you.

My suggestion: When you work out a price to sell at, work including a tracked parcel/package + Item cost + Amazon comission + VAT (if applicable) + basic costs of running a business (eg 3% of value) + allow % to cover returns and refunds + profit margin = total cost.

Check other Sellers and then decide if you want to sell at a profit, or a loss!

(NOTE: Buy Shipping will protect you if late delivery feedback issues, but other couriers like Hermes may be cheaper for you and still tracked)