The best way to learn Arduino, as with any other hands-on skill, is to practice creating a project. You can find a host of ideas online, but the best resource to find Arduino projects to try is ...

Temperature and humidity measurements are a nice addition to many hobby projects. But [Rajendra Bhatt] makes the point that many of these sensors have a price tag that is well above what most hobbi… ...

You'll need an Arduino along with a bunch of various sensors to get the project rolling, and once it's all set up you'll have a simple, but cheap system to monitor your home.