If you want amiibos bonuses this is by far the most effective way to do it without starting an expensive collection.
Currently, we're aware of two features that involve amiibo in Animal Crossing: New Horizons:
1.Get Poster
2.Photopia
Cards List:
No.1:Blathers
No.2:Celeste
No.3:Cyrus
No.4:Digby
No.5:Isabelle - Summer Outfit
No.6:Isabelle - Winter Outfit
No.7:K.K
No.8:Kapp'n
No.9:Kicks
No.10:Lottie
No.11:Mabel
No.12:Reese
No.13:Resetti
No.14:Rover
No.15:Timmy & Tommy
No.16:Tom Nook
No.17:Villager (Super Smash Bros)
No.18:Isabelle (Super Smash Bros)
Please Note:
Using amiibo is easy, but the ability is turned off by default in the game. To switch it on, open the "System" menu, and then turn amiibo support on.
Some amiibo cards need to complete the corresponding tasks or levels in the game to use.
Compatibility and functionality of amiibo cards may vary per game.