One way to earn small amounts of bitcoin is through the use of "click-to-pay" sites that allow you to watch advertisements or complete small tasks (think surveys) in exchange for Satoshi, bitcoins smallest denomination. One Satoshi is equivelent to 0.00000001 BTC, or, in USD, 1
Satoshi = USD $0.0001123123. This does not seem like a very lucrative market for generating bitcoin, but if you find the right site or faucet and engineer it just right, you can receive a steady flow of satoshi that will, eventually, equate to bitcoin. Below is a compiled list of active faucets that pay satoshi.
https://www.macobserver.com/tips/deep-dive/get-free-bitcoins-faucets-that-pay/
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