Feline are superior

Suppose I add keywords to an old published post, will it matter for search engines? Or does it matter only when the post is published for the first time? What if it's been a while since the post was published, and I add the keywords, would the search engines still find it?

If people quote your site in their answers in quora and yahoo answers, and link to your site, does it help with search engines?

Are their products real, or do they claim those are vitamins and minerals, when they don't have any value or vitamins?

If you accept a guest post from another blogger in your niche, do you start a new post and copy the guest post, mentioning the name of the author of the post and leaving a link to their site at the end of the post?

Or is there more to it? Do you have to link to their site from a main page, too?

If I link out, I know I'm providing other sites with valuable backlinks, but does it help MY blog, too?

No, I'm not talking about paid links or getting a link in return. I'm talking about naturally providing links to good sites that I believe are relevant and add value.

If I visit a blog that writes about what cats dream about, and I write a comment in the comments' section; "There's also a difference between the dreams of a cat who doesn't go outside and a cat who does, and what a cat dreams about depends on the cat's personality. I wrote an article about it." And then I leave a link.

Is leaving a link under the circumstances considered spam?

I mean, suppose I wrote a post about the same thing another website wrote about, but from a different angle, what words should I use? How would you write the email? I have a cats' blog.

If someone reblogs your post and shares it on their own wordpress blog? Does that count as some kind of backlink? Does it help search engines find you?

I have a blog about cats. I found a website that teaches five games you can play with your cat. I played one of them with my cats, took a video of them, and wrote a post in my blog about my experience. I wrote that I've found the game in the website, that there are other games in the website, and left a link.

Can this be considered copyright violation, because I wrote about how to play the game?

What if the cat looks directly into the camera? I mean, the cat is alone in the camera when you're not in the house? You can see the camera here https://www.amazon.com/gp/product/B07R3G87RG?ie=UT...

I'm 53 and a half, a little overweight but not much, female.

During the last months, I have mild pain in my knees, especially the right one. The pain is often on the left side of my right knee, just a bit left of the center, and sometimes I feel my knee clicking when I walk.

I've scheduled a doctor appointment, but it's a week and a half from now, and I'm worried in the meantime.