Cache settings in Kodi 21.1 Omega in Services for ONN and Firestick

How to determine optimum values in Kodi Settings/Services/Caching?
I have ONN, also Firestick, Surfshark, fast internet, but still get some buffering.
I know about clearing the cache and other buffering tips, but I’d like to understand and try changing these: (besides using Crew wizard)

Buffer Mode
Memory Size
Read Factor
Chunk Size

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