How can I market my online store in social media and web. I cannot see any program about this.
There is no one size fits all answer. What kind of store? Who are you selling to? What problem do your products solve?
If you are building a Shopify store, there are social media widgets that can be added in a footer and then create a social media handle respectively. However, basics of social media marketing include the creative element that your post must has. You can promote offers, deals and giveaways through contests on social media.