As a lover of the franchise of Etrian Odyssey, I'm really grateful about this HD remake from ATLUS and SEGA. This reminds me of the time when I truly really enjoyed a video game, on a weekend afternoon when I was still a high school student.

Here're some hints that you may find useful later:

1. Buffing the party is important. In EO3, the Prevent Order skill makes a row of your party immune to ailments (wear off after nullifying), use it properly.
2. Due to subclassing, the original class might not be the best caster for some skills.
3. The player party is so invincible (if treated correctly, of course) that you won't need any guide until post-game. Some post-game boss fights (Anemone, Divine Dragon, Abyssal God) will require understanding game mechanisms and behavioral data in advance. In that case, I will recommend: https://lpix.org/sslptest/index.php?id=153729 . It provides data and only data, leaving the assembly work to player, without ruining their game experience.
4. On fighting the Abyssal God: If RNG betrays you, make retrials, although you've got to know you're on the right track.
5. On sea quests: NPC allies will get a share of EXP as if they were members of your party.
6. The rarity of stat books: LUC > VIT > AGI > STR & TEC. Although the books of STR & TEC are not obtainable until the 4th and 5th stratum, they are easier to come by given that there're a lot of FOEs dropping these books.