Always carry at least 5 Tents on you, you never know when you need one!
Buy every new materia you can, 'cause in time you may want to get a Master materia and for
that you'll need a mastered one of every materia of that color!
Don't be scared of fights, as they will give you LOTS of EXP/AP/GIL in time. Especially if you're on a location
where you can sleep/get your HP/MP restored for free and where there are strong enemies!
Building up levels (and CASH!) is very useful!
Move people with long range weapons (or the long range materia) to the back row.
This way they'll get half the fysical damage done to them!
To teach someone their limits use a Hyper and a Cover-materia!
Use Restore with linked All materia to heal your complete party at once. Push [PgUp] to change to one person.
Use lots of counter attack materia's (ESPECIALLY IN BATTLE SQUARE!!!) I once played for 3 hours with only
counter-type materia's and I thought it was VERY easy (but boring). If you have like 20 Counter Attack's and
3 Magic Counter's and 3 Command Counter's equip them all on your party and have a go!!! It's fun (for a while)!
Use MP-absorb with Summons, because they require lots of MP to be cast!
Manipulate all enemies, they MAY have an Enemy Skill on them!
(for more details on the Enemy Skills, see Enemy Skills!)
Final Attack with linked Phoenix or Revive: If you die, you'll be revived again!