There are several movie databases available on the Internet.  The main issue is that they are generally updated by folks like you or I, thus some of the data may be inaccurate or incomplete.  But if you have a question about a movie title or a person associated with films, you should check these websites:

•   The Internet Movie Database (IMDb) has a searchable database on actors, actresses, films, directors, studios, etc.: https://www.imdb.com/
• Trying to recall the name of a cliffhanger?  This is not a searchable database, but Joseph Scoleri III's 'Maverick' website has listings of all silent and sound serials. When I checked in early 2025, his website was no longer working. But the Internet Archive has a saved copy of his serials listing at: https://web.archive.org/web/20130614010947/http://www.themaverick.us/home/serial.html
• The Serial Squadron also has a listing of cliffhangers: http://www.serialsquadron.com/reference/index.html

There are many websites that offer 'streaming video' of old movies, serials and TV shows --- some offer free access to these films, while others require payment. There's two wonderful websites which offer free access to old westerns and serials:

Though sometimes slow, the Internet Archive website is the clear winner on old movie downloads. No fees, no registration, no ads ... just download the file to your PC or Mac or view the movie online. They have a bunch of public domain westerns, mysteries, cartoons, serials, TV shows, more. They even have old time radio broadcasts for you to download. When you get to this webpage, look at the box toward the top center of your screen, and you can browse their film list in alphabetical order, by recent additions, etc.: https://archive.org/details/moviesandfilms?tab=collection

YouTube has a variety of public domain westerns and serials which you can view or download. At the top of the homepage, enter "Ken Maynard" or "Tim McCoy" or whatever into the search box: https://www.youtube.com/

Many of the 'Satellite/Cable/TV schedule' websites require you to do some work in order to deliver your particular schedule ... so you have to identify your zip code, the name of your cable or satellite dish company, etc.  Some require you to 'register' (most are free) in order to access some content.

• Schedule for Starz Encore Westerns Channel: https://www.starz.com/us/en/schedule
• Schedule for AMC (American Movie Channel): https://www.amc.com/schedule
• Schedule for TBS: https://www.tbs.com/schedule
• Schedule for Turner Classics (TCM): https://www.tcm.com/schedule
• Schedule for TNT: https://www.tntdrama.com/schedule