I know, and My Opinion is, Social media is a best way to express online business. But How?
You tell us...
I think the best thing of social media is the direct interaction between customer and business owner
Yes, social media is a best way to express online business. You need to create profile for your business in social media platform like FaceBook, Twitter, Google Plus and Linkedin. After profile creation add more friends and connections relevant to your business services.
You need to join groups and pages related to your business by send the request. You need to active your accounts by posting news, banners, text, articles.
Surely there's no "one size fits all" solution here, @aanchalkaura. Which platform (if any) is useful for your business will surely depend on factors such as your niche, your target audience and your aims (increased traffic, more conversions or whatever). You would not use the same approach for a funeral director as for a motorcycle dealer or a shop selling baby goods. You need to target your approach accordingly - and remember that social media is intended for being social.
Post authentic and quality images and flaunt reviews/customer experiences
on each social media platform your have option to provide your full business details and you can also post banners, content, videos to express your business services.
I think the best services for doing business are Facebook, Instagram and YouTube. These are the most popular services. You should pay attention to your content. You should post only unique and useful content. It will help you gain audience faster. Online business takes time to develop.