Aries
What is already familiar, instinctive, and ready to be carried forward.
Taurus
What is arriving, stretching the old shape, and asking for a new response.
A cusp is best understood as a threshold image: Aries's fire cardinal quality meets Taurus's earth fixed quality. The Sun is still in one sign at a time, while the neighboring symbolism can describe the season around it.
Aries brings
Aries is ruled by Mars and speaks through fire cardinal movement. Its familiar lesson is about the warrior.
Taurus arrives
Taurus is ruled by Venus and changes the texture toward earth fixed expression. Its invitation is to practice the lover.
A boundary, not a loophole
If you were born near a sign boundary, use an accurate birth time and place when a precise chart matters. The cusp language can be a useful metaphor, but it should not replace the actual Sun sign.