Once baby is 7 month old you can experiment with food now . Always make sure you have introduced a food item singly before adding it to a combination of foods. This way you can keep track of any allergies / reactions etc. At 7 months, you can introduce the below foods
Fruits: Chikku, Papaya Apple, peach, banana, muskmelon, plums
Vegetables : beetroot, tomato, bottle gourd, beans, peas,carrot,
Cereals: rice, ragi, duji, sabudana
Dairy: cheese, ghee , butter.
For 7 month baby, you can offer one meal and a snack for a day. Rest should be breastfeeding or formula milk . Chose the timings for meal and snack according to your baby's preference., but avoid giving any solids after 7 pm.