Why and How I do manage a certificate (cer, jks..etc) files or keystore things ?

 Why ?

In certain cases I do need to use or configure a certificates files , I do use the below tools and/or commands to manage my things .

How ?

Below is name of utilities  :

1- On Windows based host install and user this :

KeyStore Explorer

KeyStore Explorer is an open source GUI replacement for the Java command-line utilities keytool and jarsigner

https://keystore-explorer.org/

2- On Linux/Unix  :

Openssl

openssl - OpenSSL cryptographic and Secure Sockets Layer toolkit

3- On Linux / Unix

keytool

Key and Certificate Management Tool