Before you can practice the piano using free sheet music you'll need the right equipment.
A keyboard that supports USB or MIDI-OUT (nearly all keyboads, new and old, support this)
The proper USB or MIDI-to-USB cable
A compatible laptop, desktop, tablet or phone with internet access
Start by identifying your connection type
Many modern keyboards use USB to connect to computers. If your keyboard has a USB port,
this is the recommended way to connect to your computer, laptop, tablet, or phone.
USB ports most often look like this or show the USB symbol:
Though rare, there are other USB connector types that may be present instead.
Frequently the port will be labeled "USB".
MIDI is the other common connection type for both high end modern keyboards and most older keyboards.
Because most computers, tablets, and phones do not have MIDI ports, you'll need a MIDI-to-USB cable that is compatible with your computer, tablet, or phone.
If your MIDI-to-USB cable comes with 2 MIDI connectors labelled MIDI-IN and
MIDI-OUT you need to connect the MIDI-IN cable to your keyboard's
MIDI-OUT port. You do not need to connect your MIDI-OUT cable.