One of the major hurdles to becoming vegan is replacing common food groups in baking. The vegan replacements below are for eggs, milk, cream and other common baking ingredients. I hope you find it helpful.
EGG SUBSTITUTE
1 tbsp ground flaxseed + 3 tbsp water

1/4 cup pureed tofu
1 tbsp chia seeds + 3 tbsp water
1/4 cup avocado
1/4 cup applesauce
1/4 cup pumpkin
1 mashed banana
3 tbsp aquafaba
1 tsp baking soda mixed with 1 tbsp white vinegar
MILK
Almond, soy, cashew or coconut Milk – Equal parts
BUTTERMILK
1 cup = 1 cup nut milk + 2 tbsp lemon juice

HONEY
Agave Syrup, Maple Syrup or Rice syrup to taste
CREAM
Coconut cream
3/4 cup soy milk + 1/4 cup vegan margarine
YOGOURT

soy, coconut, almond or cashew yogourt (equal parts)
BUTTER
vegan butter – equal parts
coconut oil – equal parts
olive oil – 1/4 cup + 2 tbsp per cup of butter
View this other article – Vegan egg and milk replacements