The Y6 2018 features a microSD memory card reader. If your personal computer can also read that type of card (Most notebooks are so-equipped), you should be able to save music files
The Huawei Y6 (2018) is an Android phone and there are plenty of free ringtone apps such as MP3 Cutter, Zedge and more.
The Huawei Y6 (2018) is Bluetooth-enabled. Bluetooth is a wireless system which lets you connect your cell phone to other Bluetooth-enabled devices. If your computer is also Bluetooth-enabled, simply establish a connection between both devices and transfer any music file from your computer to your Huawei Y6 (2018).
Here are links to some of the free ringtones (Huawei Y6 (2018)-compatible) offered here at MartinsRingtones.com:
Free Horror MIDI Ringtones Free Tropical Ringtones Free Ringtones-a-gogo Free Techno Ringtones Listen To All Our Free Polyphonic Ringtones