The URL itself can already reveal some information about the publisher (owner) of the website and this may indicate what the quality of its content will be. I am referring here to the top-level domain in the URL.
This helps you identify which country the computer network of the website’s publisher is located in. However, these national domains (.cz, .sk, .pl etc.) do not guarantee a high quality of information.
You can consider only websites with one of the following top-level domains trustworthy:
.gov– only government institutions in the USA,
.edu – educational institutions in the USA,
.ac.uk, ac.in … – educational institutions in the British Commonwealth contain the abbreviation .ac in front of the national domain.
It can be assumed that the aim of publishers of government and educational websites is education, and moreover, only authorised people can publish information on such websites.
In contrast, domains such as .com, .org or national domains should always be checked for other indications that can reveal the interests of the website’s creator and as a result determine the level of expertise of its content (see below).
An overview of top-level domains is available at http://www.iana.org/domains/root/db/