For traffic source I believe in Social Media first.
Organic SEO and Quality backlinks from high authority sites like buzzfeed.com, boredpanda.com, huffingtonpost.com, etc helps you to gain more and more traffic with the help of quality, genuine and niche related contents.
Inbound links is another name of backlinks. The links of our site which we can get from some sites is called inbound links. Our Pages links into Other Page is inbound links.
Googlebot is a one type of the software through which google can index or crawl website. We can say that Google Bot is an Eye of Google for spamers. For the world of Internet, we can say that "Somebody is watching You"... :)
for Website Analyst I am using Google Web Master Tools, Google Analytics, StatsCounter, and SEMRush. These are the best tools but first tools by Google is the best one.