The search results provide some insights into what to buy during the Flipkart Big Billion Day sale. Here are some of the items that are worth buying:

• Electronics: The sale offers great discounts on electronics such as smartphones, laptops, TVs, and smartwatches.

• Fashion: Women can expect fantastic offers of up to 80% off on clothing, shoes, watches, handbags, accessories, and more.

• Home appliances: The sale offers discounts on home appliances such as vacuum cleaners, cooking ranges, and refrigerators.

• Gadgets: The sale offers discounts on gadgets such as earphones, JBL Flip essential 2, MacBook Air M2, and Samsung Galaxy Book Pro.

It is important to note that the items on sale may vary from year to year, and it is always a good idea to compare prices and read reviews before making a purchase.