Puppy food?

I have a 5 month old pup. she is a healthy weight and is growing well however i wonder what i can feed her still. I feed her 2 meals a day (breakfast and dinner) and leave biscuits out for her during the day. I was buying puppy canned food as recommended by one person but a family friend said the best food for a pup is biscuits to nibble on. i dont follow the feeding guide on the can as it seems so much for her tiny body. she isnt at all underweight so i know shes eating enough. i notice she doesnt eat her biscuits much, is it because shes not hungry with the 2 meals a day? when do you reduce it to one meal a day? 6 months old or not until a year old? ive bought some supermarket made puppy food - meat and veges - as variety to try this week. i also give her mince when i use mince in my evening meal. i tried her with yoghurt which she loves. should she have a varied diet? or is canned type food enough for her? shes spoilt so i want to do my best with her of course :-p