How can I check my Wi-Fi signal throughout my house?

Hello there, I'm wondering about the best way to assess the strength and stability of my Wi-Fi signal throughout my entire home. I've noticed some areas where the connection seems slower or weaker, and I'd like to identify those spots and potentially improve the overall performance. What tools or methods can I use to accurately check the Wi-Fi signal strength in different rooms and corners of my house? Additionally, any tips on how to optimize the signal for better coverage would be greatly appreciated.