Yahoo! Answers used to be a half-decent site for answering and asking questions. Unfortunately, many of the users have abandoned the site since the new format change back in 2014. Yahoo! Answers was known for its whole lifespan for stupid questions and answers, and the problem has been exacerbated in recent years, remaining the troll haven it always ways. These days the trolls are usually not the funny ones, but tryhardy trolls who throw a lot of provocative content in and leave out the funny. The community - depending on the section - often gets hysterical, judgmental, vicious, and otherwise toxic. Furthermore, there is a large presence of radical right users on the site, many of whom would make Fox News look like Obama. In addition, there are a large number of individuals who are very racist or otherwise hateful (especially against Muslims) Some of them are top contributors. Since 2011 or so, the moderation for the site has become abysmal, and relies on users to police the site. Racist, sexist and other bigoted content has been up for years, and often reaches the top results in popular Google searches. Reporting them usually does nothing. Some sections are now unofficial hate sites, and essentially the entire site becomes a meeting ground for hateful people after major events stereotypical of race/religion/nationality/etc. such as riots and terrorist attacks. Since 2014 with the new format change, the site has also become highly buggy. Additionally, one slip up on Yahoo! Answers could cost you your entire Yahoo! account, and they won't tell you why.
However, Yahoo! Answers isn't all bad. There are some sections that still provide good help to people who ask, such as the Mathematics and Physics, as well as the Video & Online Games and Computers & Internet sections. Do keep in mind that there may be occasional troll spillover.
Avoid the Current Events, Religion & Spirituality, Other - Cultures & Groups, Other - Society & Culture and Politics sections at all costs. These sections are full of hate mongers. Another section to avoid is Gender Studies, which is full of antifeminists. The LGBT section is full of trolls and often receives spillover from homophobes, too. The list of sections to avoid I provided is not exhaustive.
The Polls & Surveys section is largely used by teens and underage users (i.e. preteens) who want to rant, with some wingnut spillover, so don't expect any good questions and answers from that section unless you want to have some fun. A lot of the countries on the Travel section (for example, China) are full of negativity that often cross the line into racism.
At this point, I would not recommend Yahoo! Answers as a source of information, as you can find better information on other sites. If you want to use Yahoo! Answers, you should avoid all topics that people are emotional over, only using it for hard, emotionless facts. If you do ask an emotional question, do not expect a lot of intelligent answers. You are better off using sites like Quora for better answers.