Need help about landing page

Hello Everyone,
I need help regarding landing page. I went through internet but couldn't get satisfied answer. I got a site: mdnazmulislam.com and want landing page for this site. It'd be really grateful to have your best solution for this.

I would like to know one thing that what is the need of landing page and why is it important for any site?

Looking forward to hearing from all of you.

Thanks,
Nazmul Islam

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