Don't eat for 16+ hours stretches. For example, I haven't eaten since ~8:15PM Sunday. I have had a few cups of BLACK coffee this morning, but it doesn't have enough calories to consider my fast broken. Drinking lots of water as well. I won't have anything to eat until after 12:15PM today. That will give me 16 hours. I'll eat whatever between 12:15PM today and 8:00PM ish tonight, then start the fast over.
I try to do this cycle Monday through Friday. On Saturday and Sunday I eat any time.
IF works well in conjuction with a low carb diet, but it isn't required. Plenty of people loss weight with just IF because you typically reduce your caloric intake by limiting the hours you eat daily.
Good luck with it. It is pretty easy for me because I don't have to go to bed hungry, and I've never been big on eating in the morning any way.