?How can i make do an Excellent articles with Good SEO on my website

1-How can i make do an Excellent articles with Good SEO on my website,

Well you can write an article yourself. Or you can hire someone to write it for you. You can hire a freelancer. Or browse the Article Writing category in the marketplace and find some one that way. Or even create a job request.

2- How can i Find the best Keyword in my domain

Well you should know what keywords you are targeting or want to target and rank for based on what your website niche is. Without knowing what your website niche is, let alone what your website is. We'd just be stabbing in the dark..