The Family History Library (FHL) in Salt Lake City is the largest library of its kind in the world. Many of the 2.4 million rolls of microfilm and 727,000 microfiche can be ordered through a local Family History Center so you can view them without making a trip to SLC (fun as that would be!). Learning to use the FHL Catalog is critical to finding out what resources are available that might have information about your family.
The FamilySearch team has recently released brief on-line training videos that can help you learn to search the catalog quickly and effectively. To view the list of available lessons, go to the Family History Library Catalog page. You can search the catalog directly from there, or select one of the training videos to view.