After installing this update cydia is make easier for you. While its launching the cydia app and refreshing your sources your device should prompt you to install an new upgrade. After the installation you can simply tap on the complete upgrade option. Then Cydia is asking to close cydia and re-launch the app here after you can load it again and use it

This update is recommended for all users cause it’s an official update. Even if you are not using a hardware-based keyboard this upgrade is recommended. If you ignore this update your not benefitted.

If youre installed another way of jailbreak already installed Sileo or another package manager in default, you don’t need to worry! ignore this case (Cydia new update) Sileo and other package managers contains and comes with there own separate updates apart from cydia