There are no "best settings." Please understand that every setup, for every use case, will be very different. Any guides or videos that claim otherwise are misinforming. Your best option is to start with a base and adjust as necessary. Test, test, and test again. We are happy to offer suggestions for any issues you may be having, but we will not give you a list of settings.
As of OBS 19.0.0, an Auto-Configuration Wizard was added to help new or inexperienced users select streaming and recording settings that their PC can handle. It can be accessed from the Tools menu in OBS, and then just follow the on-screen directions. You can use this tool to get a set baseline settings for your hardware. Lastly, please note that the wizard is currently in beta!