This is High Definition (HD) resolution (1280 x 720 pixels). It offers a sharp image that balances quality with a smaller file size compared to 1080p or 4K.
This refers to the color depth. Most standard files are 8-bit, but 10-bit allows for over a billion colors. This significantly reduces "banding" in dark scenes or skies, making the heavy CGI and atmospheric shadows of this episode look much smoother. His.Dark.Materials.S03E07.720p.10bit.WEBRip.2CH...
This means the file was captured/encoded from a streaming service (like Max or BBC iPlayer) rather than a Blu-ray disc. WEBRips are generally very high quality and identical to the streaming source. This is High Definition (HD) resolution (1280 x 720 pixels)