In simple words
A transit is where a planet is in the sky now, compared with your birth chart. Here, today's Mars makes a opposition (180°) to the spot where your Sun was when you were born.
It is a time of pressure that pushes you to grow, and it lasts about a week. Your Today page tells you when it is happening for you.
Love
A partner may seem demanding. Hear them out.
Avoid power struggles.
Disagree respectfully.
Work
Rivals or challengers appear. Respond with skill.
Negotiate firmly but fairly.
Do not let others set your pace.
Mood
Tension in the air. Find a healthy outlet.
Rest after confrontation.
Protect your energy.
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.