You cannot craft a saddle in vanilla Minecraft
Find a saddle in dungeon chests
Find a saddle in desert temple chests
Find a saddle in bastion remnant chests
Find a saddle in nether fortress chests
Find a saddle in village chests
Find a saddle while fishing
Trade with a leatherworker villager
Kill a ravager to get a saddle
Remove a saddle from a horse, pig, strider, or camel using a saddle slot interaction if available in your edition
Use the saddle on a horse, pig, strider, or camel to ride it