In simple words
A transit is where a planet is in the sky now, compared with your birth chart. Here, today's Mercury makes a opposition (180°) to the spot where your Moon was when you were born.
It is a time of pressure that pushes you to grow, and it lasts a day or two (longer when it is retrograde). Your Today page tells you when it is happening for you.
Love
A comment may touch a sore spot. Name it calmly.
Let someone else talk through their feelings.
Do not settle big issues by message.
Work
Busy communication may feel draining. Pace yourself.
Keep emotions out of written replies.
A colleague may need a listening ear.
Mood
Sensitive to criticism. Remember your worth.
Take quiet time after social demands.
Choose calm inputs this evening.
About the opposition
An opposition places two planets across the sky from each other. Each one pulls toward its own side of life. Oppositions are often felt through relationships, as if another person plays one side. The work is balance: holding both needs instead of swinging between them.