Family Search is the genealogy research window for the Church of Latter Day Saints (LDS). This organization has been working extensively on genealogy research and digitizing and indexing such data stores. The site allows search with multiple edits without even requiring an account. If you do create an account this allows you to save records for easy retrieval. There is no fee. Many of the record retrievals link to digitized actual documents. In some cases the result will only give a summary because the actual record is housed at another site which requires an account. This is not often a big issue.
I keep my actual family tree records on MyHeritage but I use Familysearch for the majority of my record research. This is a tool every genealogist should have readily available.