Lemmy is a federated Reddit-style Social Media platform like Mastadon is to Twitter/X.
Your instance should be one focused on that which interests you, like Lemmy.ml for FOSS and Privacy, or programming.dev for programming, etc. Shop around and find one with a good community you like that is federated with instances you also like. This means your Local Feed will have your interests.
You want one that is federated with other instances you want to see, so you can browse All for general content.
Finally, you can manually create your own feed by subscribing to communities you want, and browsing by Subscribed.