There are many ways to monetize a facebook page. Two of the most popular methods are sponsored posts and affiliate marketing. Sponsored posts are paid for by companies desiring to reach your audience. Affiliate marketing is when you receive a commission for referring a sale. You can signup for Amazon Associates or even an Affiliate network which has a much larger selection of products, compared to going to each ecommerce retailer and signing up individually for their affiliate program.
By far the best way to monetize any blog or social media account is to create a product, digital, physical, one-time purchase or a subscription. There are many choices, but ultimately you are in full control. This takes more time, has more risk, but if you do your research, communicate effectively with your page, and use your audience to get feedback & answer surveys to determine what they need and want, you can have great success. The only major issue with Facebook now is that you cannot organically reach all your followers, regardless of how engaging the content is. Typically if you post on Facebook, the post will go out to maybe 10% of your followers, if those people like and share, Facebook will show another 10% or more depending on how engaging the content is. Engagement is measured by like, shares and comments.
Due to the Facebook algorithm you have sponsor your post if you want 100% of your followers to see a post, such as a product promotion. That means if you have a few thousand followers you may have to spend $20 for the majority to see your post. This is their way of driving more revenue but it's not appreciated by anyone. But those monetizing their page already, simply have less profit, but those starting pages do have an extra hurdle, that page admins did not have a few years ago.
RE: Tell me about a Facebook page.