Amiibo .bin files are digital backups of the data stored on physical Amiibo figurines. In The Legend of Zelda: Breath of the Wild
Buy 50 NTAG215 tags for ~$12. Write all 24 BOTW Amiibo. Store them in a trading card binder.
: These files enable the same in-game rewards as physical figures, such as weapon chests and food drops.
Critically, Zelda: Tears of the Kingdom (TotK) uses the as BOTW. If you collect the BOTW bin files today, they all work in TotK. In fact, TotK adds even more drops (e.g., the Skyward Sword Amiibo now gives a Fabric for your paraglider). Your investment in learning this system now extends to the next generation of Hyrule.