I’ve already posted a guide for DHL and UPS parcels here, but Royal Mail seems to be quite common in Europe so this will be helpful too…
To track Royal Mail parcels/packages directly using URL, just copy this to your browser or bookmark:
Just replace the [TRACKING_NUMBER] with the actual tracking number supplied to you by the store. I always store tracking number as bookmark so I can quickly check the status on my phone without having to manually open Royal Mail tracking page and copy&paste the tracking number in the field. This way it’s much faster and convenient.