A Systematic Investment Plan (SIP) is an automated monthly investment — usually into a mutual fund, but the idea works for individual stocks too.
The mechanic: you buy MORE units when prices are low and FEWER units when prices are high. Over time, your average cost is lower than the market's average price.
Behavioural benefit: you never have to decide 'is now a good time?' The decision is made once, then automated. That kills the biggest enemy — emotional timing.
Practical starter: ₹5,000/month into a broad Nifty 50 index fund for 15 years, at historical returns, ends near ₹25L invested and ₹60L+ value. Boring works.