You can scan an Amiibo toy once per day to get its common unlockable. In addition to its common unlockable item, random food and materials may also drop. Note: There's a chance that 30th Anniversary Ocarina of Time Link will drop the Biggoron's Sword as his sword drop. This is separate from his actual rare drop item, the Ocarina of Time Tunic. Additionally, 30th Anniversary Wind Waker Link can drop the Seabreeze Boomerang as his gear drop (his actual rare item drop is the Wind Waker tunic).
You can scan an Amiibo toy once per day to get its common unlockables. These are the items you can get from the chests if you don't get the rare unlockable. Note that some items won't appear unless you obtain the Paraglider or complete one Divine Beast dungeon.
You can scan each Amiibo once per day. A few of them have rare items. Each time, you have a random chance of the Amiibo dropping it's rare item. Note: Epona is guaranteed to drop the first time you scan SSB Link, but it only ever happen once per save game. You should only summon Epona if you have access to a Stable to keep her permanently.
If you shoot a horse with an ice arrow and approach it from behind, you can mash A when it comes out, and mount immediately, then simply mash L to tame your horse.