Activating this trainer:
Press F1 at main menu.
Listen for 'Trainer Activated'.
Press desired hotkey. All hotkeys can be changed on the trainer.
Numpad 1: Unlimited Items Use
Numpad 2: Easy Craft/Build/Recipe
Numpad 3: Mega Gold
Numpad 4: Freeze Time
Sleep/Save often so you can return to previous state if you do something with the trainer that the game did not intend and cannot be undone!
Numpad 1: Unlimited Items Use - you need to place, or use at least one item at least once during the current play session. Then toggle this on and you can use items and they won't decrease in your bag.
Numpad 2: Easy Craft/Build/Recipe - you need to have attempted to build, cook, or craft something at least once in the current play session. Next, toggle this on and try again, and many things will complete even if you do not have enough of the item. If it costs, money you still need the Gold.
Numpad 3: Mega Gold - press when you can see your gold and you have more.
Numpad 4: Freeze Time - toggle on and the passage of time during the day is frozen and you can take your time doing things. Please note that portions of the game will unlock when a new day arrives, so use this for farming and exploring, but you will eventually need to sleep.
Unlock more trainer options including updates from here - Harvest Moon: Light Of Hope Trainer