How To Safely Remove Old Kernels From Linux Servers | Clean Up /boot File-System Safely in RHEL 7/8

How to extend boot partition

sir when i type rpm -qa kernel i am getting how i know which one is old kernel [root@localhost ~]# rpm -qa kernel
kernel-4.18.0-240.22.1.el8_3.x86_64
kernel-4.18.0-240.el8.x86_64
[root@localhost ~]#
rpm -qa | grep kernel
kernel-tools-libs-4.18.0-240.22.1.el8_3.x86_64
kernel-core-4.18.0-240.el8.x86_64
kernel-4.18.0-240.22.1.el8_3.x86_64
kernel-4.18.0-240.el8.x86_64
kernel-tools-4.18.0-240.22.1.el8_3.x86_64
kernel-core-4.18.0-240.22.1.el8_3.x86_64
kernel-modules-4.18.0-240.el8.x86_64
kernel-modules-4.18.0-240.22.1.el8_3.x86_64

change amazon linux kernel into generic?