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I'd honestly say you could start anywhere. Link to the Past and Ocarina of Time probably get the most people saying they are their favorite entries. Majora's Mask and Link's Awakening are like the hipster cred Zelda titles. Wind Waker babby's first Zelda.
Zelda 1 and 2 are the ones that are the hard ones though and Zelda 2 has a group of ardent fans but most really don't like it.
Can't say anything about the Oracle games, or the DS games, Minish Cap and Phantom Tracks?, I played a couple hours of Skyward Sword, it has motion controls and it felt weird or the Breath of the Wild.
Unless you really plan on playing the whole series and want the evolution of the series just pick a game that came out before like 2003. Really the Zelda games are very formulaic and have mostly the same game play even after the switch to 3d. The exceptions being Zelda 2 and Majora's Mask but that was more by virtue of the nature of the game itself than gameplay if that makes any sense.
There's also an Official Nintendo timeline of Zelda games that may be worth checking out but there will be immediate spoilers if you even so much as look at it.