cmp_nvim_lsp not found

[PrathmeshVishwakarma]

just a quick question, on how to correctly install nvim-cmp.
I asked for help here: hrsh7th/cmp-nvim-lsp#70
but no reply.
Also can you all suggest some guide to help me through configuring lsp and auto completion (new user here)
It would be great to learn these!
Thanks for your time