Help with macros

Sorry why is it important to keep fat down? I have around 70-80g fat a day, maintaining (losing inches, not kgs) and weightlifting.

Explain?

70-80g isn't really much. I average 100g or so, and that's following the .5g per lb guideline. Basically it goes as follows: it's easiest to stay healthy and injury-free by keeping a minimum amount of dietary fat (see above). It's easiest to build muscle by keeping a minimum amount of protein intake (opinions vary but somewhere between 1g per lb LBM and 1g per lb body weight is pretty common). The rest is filled with carbs when bulking, usually, cause carbs fuel the workouts you perform when trying to gain and assist in protein synthesis and are less easily converted to adipose than dietary fat.

When cutting, you can go a couple of different ways. One is to keep the same formula but decrease calories. Another is to cut the carbs way back and increase fat intake, mostly because fat is more satiating and you don't have to worry about depositing the dietary fat as stored fat if you're eating in a deficit. This leads close to keto during cut cycles for some people, but different folks have varying levels of success with keto, and if you're on an extended cut, it can be wearying.