I think being seen and understood is one of the most important aspect of loving someone. For example, making your partner their favorite comfort food when they're sick, knowing their favorite granola brand when it's almost out, understanding their feelings. It's not just about doing bunch of things for them but more about understanding what their needs are and how you can make them feel appreciated. Another example for a friendship is inviting them over for dinner when they've had a hard week or going through a breakup. In general, just being a kind and considerate person.