1) The present simple tense is used to describe habitual actions and general truths. It uses the base form of the verb except for the third person singular which typically adds -s.
2) The present simple tense can be used in affirmative, interrogative, and negative forms. It is used with time expressions like frequency adverbs or terms like every day.
3) Examples are given of how the present simple tense expresses facts, habitual actions, opinions and feelings using common verbs.