So I googled something about final fantasy and found this thread, I didn't read all 32 pages but it seems some people are still new. This is my recommendation on how to play the game min / max.
Frist the best units in the game are
DEBUFF / DAMAGE:
Vaan:
Vaan - Final Fantasy Brave Exvius Wiki or Warrior of the Light:
Warrior of Light - Final Fantasy Brave Exvius Wiki
these two units are a more or less must have seeing that they have full break, which without it it will be extremely hard for you to kill any end game boss. Most units have some form of break, but if you use full break you are breaking everything thus leaving your other 5 units ( including a friend ) to wreak havoc. However if you do not have either of these units I would strongly suggest only friending people who do so you almost always have a full break on hand.
HEALERS / SUPPORT:
Garnet:
Garnet - Final Fantasy Brave Exvius Wiki or Lenna:
Lenna - Final Fantasy Brave Exvius Wiki
these two units are currently the best healers in game, garnet is simply better because she has revive.
PHYSICAL DAMAGE:
Chizuru:
Chizuru - Final Fantasy Brave Exvius Wiki, or Fencer:
Fencer - Final Fantasy Brave Exvius Wiki
Chizuru is hands down the highest damage champ in the game at the moment. One of her abilities allows her to hit 4 times its op. The fencer is good but not as good.
MAGIC DAMAGE:
Kefka:
Kefka - Final Fantasy Brave Exvius Wiki or Tellah:
Tellah - Final Fantasy Brave Exvius Wiki
Kefka is the best due to the 35 unmitigated ability. But Tellah has osmoses which drains mana so essentially he is the best champ.
With this set up you can beat most mobs in the game. If they are geared accordingly.
Right now the best accessories in the game are the hero rings (
Hero's Ring - Final Fantasy Brave Exvius Wiki ) you get the recipe from completing trophies, its expensive to make, but each of your damage dealers / hybrid damage dealers should have one, and your healer should have a ribbon ( kefka's trust master ) to prevent them from any status aliments, and a hero ring.
ESPERS:
You get something like 10% of your espers stats. Most people don't know once you hit 30 on them you can go back to the shrine you found them, fight them again and make them 2 star with a whole new sheet of added stats, then once they hit 40 you can fight them again making them 3 star.
PERSONAL ADVICE:
1. Do all events they offer except the gillionaire.
2. Do not spend mats leveling up worthless units, a lot of the units are trash even at 5 star. Ferya for example is one, though she isn't the worst unit ( she has a 900hp regen whole team 3 turns ), the rest of her kit kind of stinks.
3. Do not do the daily 250 lapis summon. I know its half price, you get about 150 lapis a day sometimes 250 ( depending on what goal the app reached ). Save your lapis and spend the 5k on 10 summons which grants you at least one 5 star. Personally I have done like 4 - 5k summons, I have never gotten a 5 star unit, but I have gotten multiple 4 star units that could be upgraded to 5 star. The thing with the 250 lapis a day summon, is you are not guaranteed anything but a new hero, even if you get lucky it could be a 4 star Sabin ( which can't be upgraded to 5 star )
4. SPR MAG and ATK are three most important stats in the game. In that order. SPR = monster magic hits your for less ( most even npcs have a script that includes inflicting some sort of aoe magic damage ). MAG makes your abilities hit harder, and ATK makes your physical attacks hit harder.
5. Other than your healer you want to equip everyone with abilities that boost those stats. For example, using the list above, you don't need a Chizuru with poisona, equip her abilities boosting spr, mag, attack or hp. The only people I would recommend not doing this on is your healers if they are lacking a status aliment cure. You can also give your units abilities through their espers.
6. Make sure to equip each unit with the best esper. For example Rain has fire spells, he doesn't need Ifrit. Give him Shiva, so then you can set up combos with the other main story character.
7. The main story characters suck.
8. Quickest way to level is through the vortex - adv
9. Quickest way to sacred crystals is through the vortex - adv.
10. Fire megacryst farming should be done at dwarves forge exploration. Ice Megacryst farming should be done at Miranda Coasts exploration.
11. Keep saving your star quartz, nothing is out currently worth spending them on.
12. Do your daily quest daily, at a min you can do them all with 24 energy. 3 story = first stage three time ( about 2 minutes on auto )( 3 energy ) 2 exploration = earth shrine exploration ( 6 energy ) 3 vortex - adv inter ( 15 energy )
13. Farm your trust master. Pick a group as your main group, right now mine consist of Fencer, Chizuru, Lenna, Tellah, Cloud of Darkness. Run earth shrine stage 1 until you get this knot in your stomach and you think you will pass out then run it some more. If you get lucky you will get 1% trust for at least 1 of your heroes, or something like that. Also the trust also awards free items at the end of any stage you do, so its worth it.
CLOSING:
I don't know how much time people are able to play but this is my day is I wake up do 3 vortex adv for 45, then I turn that in to get 15 more, run 3 first stage, then 2 earth shrine exploration, then 3 coliseum, then craft a potion, then send gifts. At lunch I run more adv, then when I get home I run more of them, depending on what events are going on. But, if you have time it is well worth it to run Dwarves forge exploration, or Miranda Coast Exploration. They both ( If you do every battle in each section ( 15 a section ) for a total of 30 ), it will net you items that will help you ( like items to craft the hero ring ), along with magicite to upgrade your espers, and 60k exp. However it takes about 5-10 minutes to run these and clear all the battles.