If I open new blogs in the same niche, and put links from those blogs to my blog, how will it work with search engines? Would it help or hurt, or not make a difference?
I have a cats blog in wordpress.com, and I can write blogs about animals and pets in blogger. Can that help?
I think any links are good. I read an article on this topic, I do not remember the name but it seems to be here https://wadline.com/mag
You obviously can use your website to promote another website. There is nothing wrong. That means you are taking backlink from your website. Google will take it as an external backlink of your site. And Your both site will get a backlink. It's not a problem for the search engine. Rather it will help. But don't over-optimize.
Building links between different websites is always a good thing (if the websites aren't spam of course) and they bring authority to the website, boosting SEO and allowing people to refer to other things they may also be interested in. Go for it!
It depends. If you want to direct visitors to your site, it always helps. But for SEO purposes it only helps when the links come from different hosting services.
Yes you can do this. Just be careful with reciprocal linking. A little is ok. Too much undermines the value of the links in my understanding
You can link to your cat blog from the other one. It is okay to let your readers know about your other blog. But if you send lots of links to your blog from different blogs that you have, and use your main keyword in the anchor text, it can get your blog penalized for link spam.
I dont think it will be nothing wrong with this if they are relevant for your audience ,search engines dont have any problem with this .Plus the other blogs thei will rank better as they have backlinks from your new blog
Link to your main blog from new niche blogs sparingly. It can help with SEO if done naturally (relevant content, avoids link stuffing). Excessive linking (too many, irrelevant) might be seen as link manipulation by search engines and could hurt your ranking.