The Champion Points system is one of the widest vertical progression systems in ESO, featuring a staggering number of passives that you can choose from (called 'slottables') allowing for a lot of build tweaking based on the situation. This article goes over how useful some of these slottables are for group PVE content. If a slottable isn't mentioned then it likely has no use for PVE (or the use is extremely niche).

Red

• Boundless Vitality - Almost always used. More health means more potential combinations of damage ticks you can survive.
• Fortified - Almost always used. More armor allows you to take more incoming damage.
• Rejuvenation - Used often on DPS. More sustain can help increase your damage if you have sustain issues.
• Slippery - Used somewhat often on all roles. Aside from it making the break-free cost nothing (helping your stamina sustain) it will break free the first tick you're able to break free, making certain mechanics very safe.
• Expert Evasion - Used often on all roles. Free dodge roll helps stamina sustain and can save you in situations where your stamina too low to roll normally (such as when you use Coral Riptide).
• Celerity - Used occasionally on all roles. The free movement speed can be beneficial for doing mechanics or easily avoiding AOE damage.
• Spirit Mastery - Used often in progression groups. The expectation is that people will die often in progression groups, so being able to revive someone 33% faster means you're much more likely to recover from otherwise dire situations.
• Shield Master / Bastion - Niche use for supports (and DPS in the case of Bastion). Shield Master affects ultimates meaning it can reduce the cost of Barrier which can be helpful. Bastion is useful for DPS when the boss has shielded health (Such as the shells in the Xalvakka fight) and is useful for making stronger shields with Barrier or other shield skills.
• Siphoning Spells / Bloody Renewal - Niche use for DPS. Only used in solo content or for very specific mechanics in trials (Such as portal in Bahsei Hardmode).
• Ward Master - Niche use for tanks. 10% damage mitigation is very good in fights where it's needed and the condition to proc it is very easy in a raid setting (either your own shield or a shield from supports)
• Bracing Anchor - Niche use for DPS/healers and occasional use on tanks. In fights with a lot of mechanics to block (such as first two bosses in vKA) the bonus block mitigation helps survivability a lot. Tanks can use it more often but the downside of movement speed being reduced can cause more issues.

Blue

• Focused Mending / Swift Renewal / Soothing Tide - Combination of these used on all healers. Pick two of these on a healer based on what is needed (Most likely AOE and HOT increases).
• Enlivening Overflow - Used very often on healers. Pick this or Hope Infusion.
• From The Brink - Used occasionally on healers. In fights where there's a lot of incoming damage the shield this gives can be very useful.
• Hope Infusion - Used very often on healers. Pick this or Enlivening Overflow. Less mandatory now that scribing skills can give the group Minor Heroism, but still useful.
• Reaving Blows - Used in solo content for DPS. Can also have niche use in situations where you can't be healed (such as the Frenzy vampire skill).
• Wrathful Strikes - Used often on DPS. Good generic damage increase if you don't have better slottables to use.
• Backstabber / Fighting Finesse - Used situationally on DPS. If your class can't reach critical damage cap with the usual group buffs then either one of these can help that cless get there. Backstabber can only be used on fights where you can stand on back half of boss the entire time.
• Deadly Aim / Thaumaturge / Master-At-Arms / Biting Aura - Combination of these used on all DPS. Pick two based on what the highest portions of damage are.
• Force of Nature - Niche use for DPS. Can help you reach penetration cap in situations where group can't give the normal debuffs (such as portal mechanics).
• Exploiter - Commonly used on DPS. The best damage slottable but is conditional on group having good off-balance uptime. If uptime isn't there then any other damage slottable will perform better.
• Duelist's Rebuff / Unassailable / Enduring Resolve - Combination of these used on all Tanks. Pick two based on the incoming damage you're expecting.
• Bulwark - Used commonly on tanks. The extra resistance can help you reach resistance cap without using a more valuable part of your build.
• Iron Clad - Used on most tanks. This slottable has the highest amount of mitigation for the most common type of damage for a tank to take.

Green

• Liquid Efficiency - Quality of life slottable that essentially gives you ~20 potions for every stack you use.
• Rationer - Quality of life slottable that makes food last longer, meaning you spend less gold on food.
• Steed's Blessing - Useful slottable that makes you move faster when out of combat. Going faster never hurt anybody :^)