List
yum list
yum list installed
yum list available
yum repolist
Information
yum list installed htop
yum info htop
yum deplist htop
yum whatprovides filename
Install a RPM through yum
yum localinstall foo.rpm
Other CRUD commands
yum reinstall|install|search|remove|erase htop
Remove un-used packages
yum autoremove
List files copied by a package
repoquery --list htop