yum and rpm

yum list package-name
yum install package-name or yum update package-name/rpm
yum erase package-name
yum search package-name # find package from repository
yum provides command-name # find package according to commmand

rpm -q package-name
rpm -i package-name
rpm -e package-name

yum will not install a package that public key is not imported, but rpm will install it with warning.