How does lead generation affect interest in my product?
How can it help make good deals?

It is important to understand that for example if you are a person from the media or your work is connected either to advertising or photos, then the ideal social network for you may be Linkedin.
Personally, I am madly impressed with Linkedin as a person who works with advertising and creates his own individual product for each customer.
This social network can help you understand a lot of internal work processes.
Also, you can find their partners for work and just people of interest with whom it is pleasant to communicate.
You can see this in more detail about why this social network was created and what its advantages are among others.

Many people neglect this and do stupid spamming, which is a very big mistake if you want to find good customers.