Type the Buy 1 Get 1 Free code yourself at checkout during the Raksha Bandhan sale, and check that the cheaper item shows as free before you pay, because the code does not apply on its own.
In the Raksha Bandhan Buy 1 Get 1 Free offer, the cheaper of your two items is the free one, so your saving is only as large as that cheaper item. Pair two items of close price, such as two 200 ml bottles or two gift boxes, instead of a full-size bottle with a small pack. The two items can come from different categories, and gift boxes count.
This offer's code cannot be combined with other codes or promotions, so the 10% welcome code does not add on top. The welcome code works only on a first order, so if you are new, use it on a small order before August and keep the pair offer for your next order.
A single item gets nothing from the pair offer, so in August a one-product order saves only if that item carries its own sale markdown, which goes up to 50%. If it is not marked down, hold the order for the Diwali 25% sitewide offer in October-November, which runs until Diwali day. The Women's Day offer in March is a free Glow Kit worth INR 2,499, so its value only counts if you will use the products inside the kit.