Use components to build interfaces. Search the component's name in the Component panel (Shift + A) or use quick search (Ctrl + E). Once you added a Component to your page unlink it to make changes. Right-click on the symbol’s label and choose unlink from symbol. This is the rule. We use overrides only as an exception for simple components that you'd rather want to re-style on the specific page within Style Guide (buttons, toggles etc. - mostly atoms).
Buttons execute an action, either in the background or foreground of an experience. Different button categories help guide users through certain actions. Buttons express what action will occur when the user clicks or touches it either by text, icon, or both. Additional meaning can be derived from the button style.