Sheep Leather:
Synthesize a Goblin mask with a Wind Crystal to get a Sheep Leather.

Grass Cloth:
Synthesize a Yagudo Necklace with a Wind Crystal. This will get you
three spools of Grass Thread. Synthesize them with Earth Crystal to
get Grass Cloth.
Hint: Silk Thread:
To get Silk Thread very easily, defeat Crawlers in East Sartabaruta.

Raise White Magic level easily:
This trick is useful to level up much needed spells such as Protect,
Cure, and Shell. Go to a local residential area and stand directly
outside your Mog House. Cast the desired spell on yourself until you
run out of MP. You can also cast it on other players running in and
out of their Mog House. Once you have run out of MP, run into your
Mog House, replenish it, exit, and repeat. This saves a large amount
of time from having to heal after casting. You can level up magic by
casting the spell on yourself, despite if you already have the
enhancement on yourself or have 100% HP. Keep casting and it will
level up.

Easy gil:
Whenever you get Crystals in battle, put them in an auction for
about 100 gil each. You will make good money this way, or you can
put them in your bazaar for about 50 gil each.
At 6:00 in upper San 'Doria, the Wood Guild opens. There, you can by
Arrowwood Lumber for 7 gil each. They sell for approximately 100 to
150 gil each. Also, the Luaun Lumber makes a profit, but not as
much.
This trick requires three party members in Bastok. Behind the
lighthouse in South Gustaberg is a bush labeled as "???". There, you
can trade a Quus to have Bubbly Bernie spawn. He is not very
difficult to defeat and drops a Steam Clock. If you set the second
person to Quartermaster and make him wait at the entrance to Bastok
Mines, he can run into the auction house and send it to the third
person, waiting at the Mog House in Bastok Markets. The third person
should take the clock to Malene in the very northern part of the
town. She will give you 500 gil per clock. You can repeat this as
many times as desired. Note: You can only hold one clock at a time,
but you can have as many as you desired inside your delivery box.
Once you at about level 5 (depending on your main job), collect Silk
Threads from Crawlers in either East or West Sartabaruta, outside of
Windurst. They can sell at the Auction House for 1,000 to 2,000 gil
each.

Bastok Mines: Entering the Zehrun Mines:
Go to Bastok Mines. Near the left on your map is a circle. Go there
and enter the passage, and you will be in Zehrun Mines.

San d'Oria: Recommended places to level up:
Go to the following locations in San d'Oria when at the indicated
levels to level up easily.
Level 1 to 7: West and East Ronfaure
Level 7 to 13: Ghelsaba Outpost
Level 14 to 18: Valkrum Dunes
Level 19 to 25: Peninsula
Level 26 to 34: Jugner Forest
Level 35 to 43: Davoi (possibly)
Level 44 to 52: Xarbard
Level 53 to 60: Deep King Ramperre's Tomb
Level 61 to 75: Ifrit's Caltron

Final Fantasy logo:
When you board the airship and the screen is on Steiner in the front
of the ship, in the background clouds you can see the Final Fantasy
symbol fly by every few seconds.