Can anyone explain in detail about the advantages of Dimension Gate ??

There are many uses for DG, some for example are:
Let's say you've got a weak monster on the field e.g. Doom Dog and your opponent has BEUD on the field. Now what you can do is to Econ take your Doom Dog for BEUD and after BEUD is summoned to your side, you would then want to activate DG thereby banishing BEUD to your "OPPONENT'S BANISH ZONE" (now here comes the tilt). When your opponent tries to attack you directly with a monster it will trigger DG whereby it will prompt you if you would like to summon BEUD BUT NOT to your opponent's side of the field but to your's whereby making BEUD YOUR monster for the remainder of the duel. DG will also trigger if you storm it off or any other card effect that would destroy it.

3 DG + Labyrinth Builder skill is as of now the most consistent farm deck we've got. It makes farming Kaiba Lv40 a walk in the park and many other LDs.

Hope this helps.

Two good uses:

1. Steal and banish an opponents monster (for example, use econ to take it for a turn, then d. gate to banish it).

As one person already mentioned, a good way to deal with relinquished, but works on any monster that is the star of your opponent's deck.

2. Pair this with PBro's Labyrinth Builder skill for farming , by locking out the opponent's ability to attack.

Banish your labyrinth wall so it is off the field and safe (for example safe from Spiritual Wind Art or other effects that might move labyrinth wall off the field), but often the AI will not attack, knowing that you /could/ bring the lab wall back and they'd take damage.

Haven't tried this yet (just got PBros with this event) but I've read about this.

it's not as good as when it first came out when it came out relinquished and hhg was a thing

'Dimension Gate' solo sirve para farmear, te recomiendo que la utilices tu mismo con duelistas SD nivel 10 para que te quede claro como se usa