Question

How can you tell that a website is valid and reliable

Answer 1

- suffix of site 
.edu = educational
.com = commercial
.mil = military
.gov = government
.org = nonprofit 
- also, if there is a listed author and they provide credentials 

Answer 2

A website that is reliable and valid will be for that purpose, and won't have much ads. Sites that send malware, phishing scams, etc, are called biased websites. 

Here are some clues to tell that a website is reliable. 

- http:// 
- Has a company, is associated with an administration. 
- Is for a certain purpose, example: to inform readers and viewers. 
- Author's name is clear 
- Date