Sir, i am use blogger and maine apki 4 tutorial dekha aap ne usme seo yoast ko use kra hai.... mai use kaise use kar sakta hu.
Unfortunately you can't, because SEO Yoast is not compatible or available for Blogger.
then what can i use for seo
To be honest with my profession, I would suggest you to migrate your data on WordPress. WordPress comes with thousands of plugins support and templates, which makes your site search engine friendly. Blogger is good but only for simple bloggers.
should i go with wordpress.com or wordpress.org ?
Both are one thing, you should need to buy a .com domain and hosting then install WordPress package on it. If you want affordable and secure hosting then we have better plan for you, we can talk in private message for further about it!
then i want to buy hosting for it and i already have a .com domain .