Dipstick question

Used to let the local garage check my oil, seems they were not doing it
correct as I lost an engine due to no oil pressure, as they didn't
understand the read of the dipstick. I'll be doing my own read and so I
don't screw up the new one, how do you read the dipstick on a 2000 4
cylinder engine, it has these plastic looking beads on it with no markings,
not a flat bar with add marks on it.. Any help most approved.

Thanks

Mike