What are the components of a language lesson?

What I understand is, language teaching has two aims:

1. Skills [Reading, Writing, Speaking, and Listening] development
2. Linguistic competence development

So, each language lesson should cover at least one skill component and at least one linguistic component.

Am I correct?

Is there a 3rd component called literacy?

E.g. Literacy includes:

1. phonological awareness
2. decoding
3. fluency
4. comprehension
5. vocabulary.