In simple words
In Vedic astrology your life moves through nine long chapters called dashas, always in the same order. Which one you start in depends on your Moon at birth.
The Venus dasha lasts 20 years. While you are in it, Venus's themes colour those years. Your chart page in Vedic mode shows which dasha you are in now, with dates.
Themes
The Venus period is the longest at twenty years. It often brings attention to love, partnership, comfort, art and the pleasures of life. Many people build relationships, homes and creative work during this time.
What it supports
Romance, friendship, artistic pursuits, refinement of taste, comfort and creating harmony at home and work.
What it asks of you
Venus asks you to enjoy life without losing yourself in it. Balance pleasure with purpose and choose relationships that help you grow.