1. Stress in compounds.
Listen to this question and sentence.
Are you online?
I like online learning.
Notice how the stress is different. In adjective compounds, where the second element is a noun, the stress is usually on the first element when the adjective is before the noun:
online learning
offsite course
But when the combination comes after a verb, the stress is on the second element:
Are you online?
The course is offsite.
Listen, and mark the stress.