There are three common ways to implement feature flags. First, the do-it-yourself method where you develop and maintain your flagging system on your own, using a bunch of if/else statements and some configuration file or database to control flags. This can be suitable for simple use cases. If you are not willing to maintain a dedicated codebase, you can rely on open-source libraries. Lastly, if you have hundreds of flags and advanced use cases like feature targeting and experimentation, the use of a managed feature flag management platform is probably the best choice.