Everyone knows the basics now however if you plan on getting an egg to raise you should also get a second one to raise at the same time. With the spoil time of the milk you will be able to feed both from the same batch of 5 you collect and save you the effort of having to do it all again with another one.
I got a level 150 lightning egg and I was so excited to hatch the egg...that when I went to put the egg down I accidentally ate it instead. :( ps4 users: R2 ISN'T GONNA DROP THE EGG YOU'RE GONNA EAT IT LIKE ANY OTHER EGG. REMEMBER THIS. LOGIC BEFORE EXCITMENT.