There are a few ways you can hide your blog from search engines and visitors. You can use a blog hosting service, use a blogging platform like WordPress, or create a separate website for your blog.
You can also use privacy settings on your blog to restrict who can view your posts. However, all of these methods have limitations and some may not be suitable for all blogs.
Blogging platforms like WordPress offer more control over how your blog is displayed and who can access it. You can set up a custom domain for your blog, which will make it more difficult for people to find, and you can also choose to make your blog private or public.
However, WordPress does not offer much control over how search engines display your posts, and you may have to resort to using privacy settings if you want to keep your posts hidden from certain groups of people.
Creating a separate website for your blog is the most secure option, but it will require more time and effort to set up. You will need to set up a hosting account and create a website from scratch, which may be difficult if you do not have experience in web development.
Additionally, creating a separate website means that you will not be able to share any content or links from your blog on other websites or social media platforms.