After a quick browse through the threads, I didn't really find any other topics that covers this in general, so I figured I might as well start one (after a ton of hours of grief on a couple particular campaign stage). Please don't hold back on throwing in your own stories, tips, questions and griefs as well OTL.

From what I've noticed, you can pretty much throw any type of squadron wherever you want and still earn 3-Medals after a couple tries from Normal Campaigns #9 and below. #10 (which I just finished 100%) and up start to get trickier from there, so that's what I'll chat about for a bit.

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10-5 caused me a ton of grief; not only because there's a bazillion different direction panels you have to pray to RNGesus to get right, but it was also super easy to accidentally finish up the stage first, before you're able to finish mopping up all the pests and bosses on the map. Just running through the panels alone 100% correctly happens only on about a rough 10% chance, give or take depending on placements you might gamble on.

To finally nail down the 3-Medals, I had to purposely set up 2-3 of my squads to be purposefully slow, with no more than 450-Speed at max and make certain that the Northernmost squad had both enough firepower to take out the first boss encountered, but die against the final one. The placement of the rest of the team descended from North-to-South in order by speed, from slowest to fastest, with the two fastest squads occupying the same start point at the bottom of the map.

My gawd it was terrible, finally nailing down the correct path numerous times, only to finish the map with the last little bugger sitting in front of my face

I think I mentioned in another thread, but yes, character placement in groups, and group placement at start, is important. It goes without saying that you should also try to level up all characters in all groups, but most people get the wrong idea from the first two chapters and think it's all about pumping up their main party. Which probably explains why so many players on my Allies list seemed to have quit a week ago.

Equipment is important, but so is equipment slots. And to get more equipment slots will require luck, since you need to "evolve" a character with the same character (summons, map drops, etc.)

I'm sure eventually there'll be a player's guide out there. Even the Japanese Wiki is far from complete and players arguing over their theorycraft.

Server went down; time to forum rage

Edit: Ohay, servers are back mere minutes after I post

But yeah.........I went ahead and checked your past posts for aid (completely not stalker-ish) and saw lots of nice info; seems like it's actually your first time mentioning party composition and map placement, but amen for everything else. We should just copy and paste the discussions you're involved in and that'll become NA's guidebook.

Something else I noticed and that's mentioned is that the affection buffs are actually really quite OP. Certainly, the lovey-dovey scenes are probably the primary motivator to achieve 100%'s, but they actually pump out a boatload of stats, about +15 levels' worth. I was surprised to see that my base team was actually keeping pace with other players' Lv30 Evolved units; spoiling those girls rotten to the core is extremely well worth the effort.

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I actually found out and started the game a couple days late, so I missed out on the Bloom Dragons and was stuck level-capping EACH AND EVERY SINGLE ONE of my bases and feeding them gifts from a machine gun (gawddam, they are freak'n cake monsters and jewelry thieves OTL). Now that I can access the Bloom Dragons and thanks to the time spent on gift gathering, my Helper-total almost shot up 5000 points upon evolution, instead of decreasing. My overall total also shot up about 20,000, from 170k -> 190k, after boosting them back up to Lv25; this was all done today with the Red Bloom Dragon and I still have 3 more to collect.

Not sure how much of a tip this is (more common sense), but one thing I've found helpful is putting my 4 star units that buff the solar blast or have stage bonuses (as opposed to the combat buff units) into my weaker teams or the ones with less aoe. It helps with splitting up power and blast does really good damage to a 2/3 unit group.
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EDIT:

This thread actually helped me a lot with 10-5 (since it was just as annoying as OP said) so I figured I'd add what I used on it too.

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Following the advice, I made slow teams with my fast team running at the bottom and my team 4 being on the top


I was having a lot of trouble until I removed girls from some of the teams due to them killing the boss too early. Low 40k power felt the safest for the top team, but the other 3 teams that had a chance to fight the bottom boss + pest node had to be a little stronger. I also saved solar blast for all of the fights except for the bottom boss and the pest node after it to make my teams take as much damage as possible.

Helper had ~380ish speed, so I lucked out a bit there

Any tip for daily mission in campaign -> special? Cause i'm wasting tons of stamina everyday just to do that and get some FG. I'm new in game.
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Dont do dragon dailies if you dont or will not need them even for fg they give. You'll gonna do anyway in later times. As a newbie you should focus on leveling your team mainly at 2-1 map.