Bhagavad Gita, Chapter 4, Verse 28

Others again offer wealth, austerity, and Yoga, as sacrifice, while still others, of self-restraint and rigid vows, offer study of the scriptures and knowledge, as sacrifice.

There isn't just one legitimate way to do this. Different people are genuinely offering the same devotion through very different means.

Krishna lists a real range here, resources, discipline, structured practice, study, deliberately showing that the form varies while the underlying intention can stay the same across all of them.