Phantasmal would go to your Extra Monster Zone, and you'd be unable to Xyz Summon again until the zone is empty. Regular monsters in your deck can still be played, as they go to the 5 Main Zones
Synchro, Xyz, Fusion, Link and Pendulums in the Extra Deck all go to the Extra Monster Zone
If you place a Link in the Extra Monster Zones with arrows pointing to 3 of your Main Zones those zones essentially become new Extra Monster Zones, now you can summon 3 Fusion/Synchro/Xyz/Pendulum/Link monsters in those zones
If your Link points to 2 of your Zones and 1 Opponent Zone (Like with Decode Talker in the video)
You get 2 extra zones for extra deck summons and your opponent gets 1
Link Fun Facts
- They don't have a Level or Rank, they have a "Rating"
-They can never be placed in defense position, that would screw up their arrow positions
TL;DR Buy Links, Konami says so. The reception to these new rules has been....lukewarm to say the least
EDIT: Regarding Pendulums and Pendulum Zones, Pendulums are cards in your Main Deck that can be Normal Summoned as monsters, or Activated as continous spells, if you want to use them as spells you place them in one of your 2 Pendulum/Spell/Trap Zone. You can also use those zones for regular spells and traps if you dont use pendulums.
Pendulums have 2 effect boxes, one for each "mode", the upper box is their effect as a spell and the regular effect box is for their monster effects.
Pendulum Fun Facts:
-Pendulums on the field don't go to the Graveyard, they go face up into your Extra Deck
-The numbers at the side of their upper box are called "scales",
Both of these facts are used for Pendulum Summoning, but we'll get to that later