For Holy I generally go
https://www.wowhead.com/talent-calc/paladin/holy/DAHBQAAQRQBADUUQAAA
You can switch
https://www.wowhead.com/spell=469304/steed-of-liberty for
https://www.wowhead.com/spell=20066/repentance depending on your preference, tbh even options like
https://www.wowhead.com/spell=469411/a-just-reward,
https://www.wowhead.com/spell=1044/blessing-of-freedom or
https://www.wowhead.com/spell=234299/fist-of-justice can be used over
https://www.wowhead.com/spell=469304/steed-of-liberty, the last slot of the Paladin tree is fairly flexible.
For the holy tree the only change you can reasonably do is
https://www.wowhead.com/spell=414720/tirions-devotion instead of
https://www.wowhead.com/spell=31821/aura-mastery but neither are truly useful and aura mastery has the benefit of a silence / interrupt immunity that can be life-saving for a caster.
For Protection I go with
https://www.wowhead.com/talent-calc/paladin/protection/DAGBQBAQRBACVRBAAA
Once again the Paladin tree is quite flexible. Only 4 slots are fairly mandatory :
https://www.wowhead.com/spell=24275/hammer-of-wrath,
https://www.wowhead.com/spell=213644/cleanse-toxins,
https://www.wowhead.com/spell=231663/greater-judgment and
https://www.wowhead.com/spell=230332/cavalier.
https://www.wowhead.com/spell=469411/a-just-reward and
https://www.wowhead.com/spell=469304/steed-of-liberty are both the more generally useful talents but they can be switched around easily in dungeons as both of them can be entierly useless in some scenarios.
I choose to ignore
https://www.wowhead.com/spell=96231/rebuke as we already get an interrput from
https://www.wowhead.com/spell=31935/avengers-shield but on certain encounters it might be useful,
https://www.wowhead.com/spell=1044/blessing-of-freedom or
https://www.wowhead.com/spell=234299/fist-of-justice are still useful and so is
https://www.wowhead.com/spell=20066/repentance. Really the last two slots are yours to customize but
https://www.wowhead.com/spell=469411/a-just-reward and
https://www.wowhead.com/spell=469304/steed-of-liberty is a good overall useful combo.
On the Protection tree you can make a case for
https://www.wowhead.com/spell=379021/sanctuary over
https://www.wowhead.com/spell=386568/inner-light. The 4 seconds effect allows you much more mobility.
The real "fight" though is between
https://www.wowhead.com/spell=386568/inner-light and
https://www.wowhead.com/spell=280373/redoubt.
For overall uses the first one is marginally better as the shorter fights against weaker mobs may not allow you to stack
https://www.wowhead.com/spell=280373/redoubt and the chip damage if often enough to put mobs in range of a
https://www.wowhead.com/spell=88263/hammer-of-the-righteous but when it comes to dungeons,
https://www.wowhead.com/spell=280373/redoubt is king. You'll have to be careful managing it but with some haste you'll be more than comfortable enough and it's basically a 6% damage boost.
Oh and also,
https://www.wowhead.com/spell=88263/hammer-of-the-righteous is way better than
https://www.wowhead.com/spell=204019/blessed-hammer.
And finally, Retribution there is two ways, I'll explain.
For the Paladin tree it's the same thing as Holy.
For the Retribution tree now.
You have two real options :
https://www.wowhead.com/talent-calc/paladin/retribution/DAHQQAEARQBADVBEBQAA and
https://www.wowhead.com/talent-calc/paladin/retribution/DAHQQAEARQBADVBQBAAA
The first one bases its damage around
https://www.wowhead.com/spell=184575/blade-of-justice alone and uses
https://www.wowhead.com/spell=403698/lights-celerity for an instant heal. Very good setup for dungeons, makes Ret soloing that much easier and sturdy. Now at first glance
https://www.wowhead.com/spell=383228/swift-justice is the better option as it reduces the cooldown of two abilities by the same amount and both these abilites have a shorter cooldown anyways making the talent far superior as a percentage of time. The issue here is : you won't have the time to spend your holy power in dungeons as self-healing is a much more pressing matter and you're basically pressing a heal every 6 seconds and the shorter CDs will make you too crowded and waste recharge time.
For anything outside dungeons, the second tree works wonders. No instant heals but this time we go
https://www.wowhead.com/spell=383228/swift-justice, generate a buttload of Holy power then blast foes with
https://www.wowhead.com/spell=383328/final-verdict.
Simple setup, you're always pressing a button and while I couldn't tell you which setup deals more damage with 100% certainty, I really feel like this one gets the job done quite a bit better when it comes to pure damage.