queries about FreeBSD

I'm planing to use FreeBSD for the second time before that I want to ask questions I'm a Linux user and I have used Gentoo which is hybrid of Linux and FreeBSD
  • How can I install plasma on FreeBSD?
  • Is possible to install Telegram ( messaging app ) there and if possible how?
  • What feature make FreeBSD secure as OS and for servers for ex on RHEL products there's SELinux