Montags and Clarisse's realtionship is weird. If she had not died I think they would have become a lot closer throughout the book. Clarisse seemed to bring out a different side of Montag. They way she would ask him questions and make things for him.
JKS stands for Java KeyStore. It is a repository of certificates (signed public keys) and [private] keys. You can export a certificate stored in a JKS file into a certificate file. You can use the keytool utility found in Java distributions to maintain your JKS trust and key repositories.
The Java WAR file is a Java standard for deployment of a bundled group of JSP, Java servlets, html, javascript, images and other files for necessary for the development of web applications. /META-INF: This directory and its contents are generated by the jar command. Does not have to be explicitly generated.