This article will examine some of the pitfalls that come with low TTLs and will help you select appropriate TTL values.
Sure, there are many expensive tools out there to track the competition of your website. But maybe you just want a quick idea of the amount of traffic competing sites get and don't care too much about the details yet. That was me, so I built a Google Sheets dashboard that scrapes Alexa rankings.
A widespread fallacy among IT professionals is that DNS propagates through some network. So widespread in fact, that there are a couple of sites dedicated to visualizing the geographic propagation of DNS records. But DNS propagation does not exist.