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 rising sign 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
Passion and friction both rise in relationships.
Address issues directly and fairly.
Avoid blaming.
Work
Competition or pressure from others. Stay focused.
Negotiate firmly.
Do not get pulled into others' battles.
Mood
Tense around people. Take breaks.
Physical exercise releases pressure.
Rest after intense meetings.
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.