Fields
At its core eno lets us write down values, the simplest form being:
Current Temperature: Quite pleasant
With this we specify a pair of a key and a value, the key being "Current temperature" and the value being "Quite pleasant".
Some other examples:
Last Name: Schneider
Website: www.example.com
Profession: Freelance graphics artist
No value
If we don't want to specify a value, we just omit it. (the value then is null)
More information:
Next page: Fieldsets