A capital letter or a small letter?

[englishhobby]

What letter, capital or small, should be used in Foods and in adverbs of frequency here?
Lesson Plan
1. Vocabulary: Foods
2. How often? Grammar: adverbs of frequency .

 

[bhaisahab]

I'd use capitals.

 

[Skrej]

Note that the 'small' letters are also called 'lowercase' letters.