I am using online shopping services since last 4 years. With time I experienced some dos and dont while shopping online. The very first thing to consider is genuinity of shopping website, try to shop only from well known and trusted e-commerce sites like amazon, Flipkart etc. As it will ensure the quality of product you are buying, also get best discount price. You have option to replace or return product if it is damage or faulty. Try to stay away from scammers sites usually they trap shoppers by giving lucrative offers, never share your card and bank details at their websites.