Hint - Watering Can (Early)
To obtain a better Watering Can early in the game, simply water every tilled square (with or without crops on them) until your character reaches Level 2. Speak to Masami afterwards and she will give you a Weird Watering Can that can water three squares at a time.
Hint - Ranching Foresight
As soon as you purchase any animal from the World Ranch, you can go to Jonathan and speak to him to obtain the next Robot Animal Helper.
The animal you purchased does not need to have been delivered to the farm yet.
However, Jonathan will assume that you already have the animal in use and will proceed to tell you that he will send the next type of Automatic Animal, unlocking the option to purchase that type of animal from the World Farm.