Player's House - Day 1 is the easiest level ever in Plants vs. Zombies 2: It's About Time. It is PvZ2's equivalent to Stage 1-1 in Plants vs. Zombies.
The strategy here is, well, there's not even a strategy. This level is actually impossible to lose. All you do is what the tutorial tells you to. It tells you to plant a Peashooter when you hit 100 sun. Sun falls from the sky, which is worth 50, so wait until two suns fall to plant a Peashooter. Once you have two Peashooters on your lawn (which is only a single strip of grass right now), the zombies finally come. The Peashooters will attack the first Basic Zombie, causing more to come. While the Peashooters attack the zombies, more sun falls, making you able to plant more Peashooters. Once the "huge" wave of zombies approach the Peashooters will win no matter what, and you win the level. You unlock the Sunflower, and move on to Player's House - Day 2.
This is the first level in Plants vs. Zombies 2: It's About Time
It is impossible to lose. Just try it.
This level is the only level in the game that's impossible to lose.