PdaNet+ is a very lightweight piece of software which is here to help you in the quest of sharing your Internet connection with other devices in the vicinity. It manages to achieve this task by using various available modes. The Bluetooth mode is kinda old, slow and obsolete at this point in time, and you shouldn't go this way if any of the other methods work for you.
There are two modes which are considered to be close to perfect. The first one is called USB Mode, requiring you to connect your Android device to your computer via USB cable. You should also install the Windows client by accessing the following address: http://pdanet.co/install. Once the link is established and you're able to use the Internet connection of your smartphone/tablet on your personal computer, you can go one step further and share the connection from your Windows machine with other devices.
The other convenient mode of sharing your Internet connection is by using the WiFi Direct Hotspot module. A big aspect of this feature is the fact that it works on all devices running Android 4.1 or higher. You can basically connect tablets and computers to your smartphone using the Wi-Fi technology, but depending on what device you're trying to connect to your phone, you might have to install additional software.