This depends on your Galaxy models. Most newer Qi-enabled Samsung Galaxy phones can be charged wirelessly like Galaxy S6, Galaxy S22, and Galaxy Note 5 or newer, allowing users to charge their devices without the need for physical cables. However, older Galaxy devices may need the appropriate wall chargers to get powered up. 

The speed of wireless charging on Samsung Galaxy devices can vary depending on the model and the charger being used. Generally, Samsung Galaxy phones support up to 15W fast wireless charging, which can provide a significant charge in a relatively short amount of time, but the exact speed may differ between devices and charger specifications.

Yes, it is generally safe to leave your Samsung Galaxy device on a wireless charger overnight. Most modern wireless chargers are designed with safety features, such as automatic power cutoff when the device is fully charged or Anker's MultiProtect system for short circuit protection, temperature control, and more. However, using a reputable quality charger is recommended to minimize any potential risks.

Yes, you can often charge your Samsung Galaxy with a protective case. For example, Anker 544 Wireless Charger (4-in-1 stand) is designed to transmit power through an up to 5mm thick case. However, extremely thick or metal cases may impede wireless charging, so it's advisable to check compatibility and use a case appropriate to your wireless chargers when charging.

Wireless charging for Samsung Galaxy devices is generally safe with Anker wireless chargers which come equipped with safety features like temperature control and foreign object detection. However, using certified chargers and avoiding off-branded or damaged charging equipment is crucial to minimize potential safety risks.