Dragon Fantasy: Book I

This chapter is the toughest of the bunch, so you might as well get it out of the way first.

Tips:
 

• Always have extra herbs, antidotes, ropes, wyvern powders, and (if you can afford it,) potato juice on hand. Travelling between cities can be a slog, and you don't want to lose half your gold by not having enough on hand to prevent yourself from dying.
• Personally, I found upgrading armor first was preferable to upgrading weapons. There is a 20% miss rate on weapon attacks and it's better to be able to weather any blows.
• Grind a bit before going anywhere new, as this game is supposed to be a homage to Dragon Quest/Final Fantasy. Monsters get tough rather quickly, so don't go and try to do a speed run.
• Pay attention to who has the first turn, as it will stay that way for the whole battle. For enemies that take a turn before Ogden, keep an eye on your HP and heal earlier to compensate.