Use caution when searching the Web for sources. Anyone with access to the Internet can post websites about topics that interest them. These sites are not always accurate.
Determine who or what the source is: A research or educational institution, an organization, a political party, government, a special society, an MLM (multi-level marketing) company, a for-profit company? Also find out how recent the material is.
Keep in mind:
.edu represents educational or research material
.gov represents government resources
.org represents organizations (such as nonprofits and trade associations)
.com represents commercial products or commercially-sponsored sites
In general, most websites ending in .gov and .edu (large, reputable institutions) are good resources. So are many sites ending in .org (reputable nonprofits/trade associations). When using .org sites, avoid those with political or philosophical agendas that may not be appropriate.
Most websites ending in .com are not good sources because they usually have a sales/marketing agenda.