According to me TTFB is good

Actually, Its some url open with .html/without html/ with slash & without slash. Is it good? Keep your website consistent - either use .html or not. Trailing slash do...

No correlation there. Focus on what really matters. The core. Pixel length of a page means nothing, unless it causes bad user experience.

This is just one factor that you analyze. It is impossible to answer this question unequivocally.

Thanks @ravi, The same concern for a 1-year-old e-commerce site that is made on Magento. Product URL path: https://www.website.com/category/sub-category/starting-at-rs-9...

First, use google and read about it yourself. A good backlink is thematically related to the linked page and then it generates traffic to the page.

But this will take more time. I want to increase followers immediately.

To increase your Instagram followers, you can make high-quality posts and videos. Share your post on other social media platforms. Grow your post engagement with more lik...

You'll need some good quality backlinks in the future.

Buying users is pointless. Better to spend your budget on natural user acquisition. This will have a positive effect on your Instagram profile.