Write it Down
Many people keep diaries of how their Tamagotchi evolves, where they write down what has happened and what character their egg has become. Like any good parent, you'll probably want to keep track of your pet's progress. If you decide to raise another Tamagotchi, you can review what you've written down. So you'll have a better idea of what to do :-). This is an example of how to keep a record of your pet's growth:
Your own Diary
You can keep a blog of your tamagotchi on the internet. But you could also scrible it on a piece of paper like the example above. I've made a diary which you can print out on A4 size paper and take with you. Click on the sheet below to get a bigger version to print.