You mean how much or how often?

Hatchlings are usually fed every 5 days or so, some will feed under 200 gms that often too. After that until adulthood typically every 7 days and adults every 14. Or so, they don't need an exact schedule that is for keepers.

(adults are sexually mature snakes, males seem to hit that at about 1100-1300 gm or so and females at the 1500-1800 gm range)

10% of the animals weight typically is suggested although that too is rough. About the same diameter food as snake at its largest is a visual method. If you are going to make a mistake go smaller rather than bigger. Weigh is easiest as it is not a judgement call.

Not an exact science some feed everything weekly and feed light some less frequently but heavier. The only thing I recommend is if a snake has been non feeding for a while (3 months +) then the first meal should be small as not to tax an under used digestive system.