This is the website of the church of latter day saints.
https://www.familysearch.org/en/ They have an incredible amount of worldwide information that is free to search and in many instances view microfilms of the original records.
They also have research centres where you can use their computers to look up records. No hassle, no trying to convert, no preaching. Very friendly.
If you have UK ancestors then Find my past, like Ancestry is another subscription site.
Rootsweb and various other internet sites also are worth exploring.
Did you have a particular area or background that you want to research?