Description meta-tags are a special case, and I'll be publishing a separate article about them very shortly.
But for all other types of meta-tag, Blogger's Post-editor doesn't allow any other sort of meta-tags: even if you go into HTML mode and type them in, they will be automatically removed when you publish the post or look at in again in Compose mode.
So to add other tags to specific posts, you need to
1) Edit your template - don't expand the widgets.
2) Find this text:
<head>
You may need to look for <head SOME-OTHER-STUFF>, depending on what template you are using. Usually I search for "<head", ie without the closing bracket, and make sure that I do what is needed after the closing bracket >.
3) Add this line of code after the <head> tag:
<b:if cond='data:blog.url == "PUT-THE-POST-URL-HERE"'>
< THE META-TAG YOU WANT TO ADD>
</b:if>
replacing:
<THE META-TAG YOU WANT TO ADD> - with the actual meta-tag details, and
PUT-THE-POST-URL-HERE with the full address of the post.
This means you cannot add the meta-tags until you know the post's URL, ie after the post has been published for the first time. This is a little tedious, but not impossible. You just need to publish the post, get the URL, and then edit your template and add the meta-tag info for the post
Alternatively, you could just apply the tag to your so-called home page by adding the tag with a "home page only" conditional, eg
<b:if cond='data:blog.url == data:blog.homepageUrl'>
THE CODE FOR YOUR META-TAG(s) GOES IN HERE
</b:if>
Adding meta-tags to your whole blog:
This is most appropriate for tags that genuinely should apply to every single page on your blog: what these are depends on how your blog is organised, and what you expect the meta-tags to be used for.
Again, description meta-tags are a special case, and will be covered separately.
You can add non-description meta-tags by editing your template and putting the meta-tag statement somewhere in the header, ie
after <head SOME-OTHER STUFF>
before </head>
Make sure that you put the meta-tag statement in-between the other HTML statements in the header, ie after a closing > and before an opening one>
What your readers see
People who visit your blog won't see anything different provided you've installed the meta-tags properly.
But search-engine-spiders and other computer-based visitors will read the contents of the meta-tags. This may cause them to display things about your blog differently at their end (eg a description within Facebook), but won't make any difference when a human visitor is looking at your blog.
Is it worth it?
Only you can decide if it's worth the trouble of adding meta-tags to your blog.
If you're doing it so your site ownership can be verified, then it's almost certainly worthwhile.
And obviously Blogger thinks that description tags are worthwile - because they've given us a way to edit them inside the post-editor.
But if you're doing it for SEO, so that your blog ranks higher in search results, or looks more attractive / clickable on the result-pages, then the only answer is "it depends". There area a lot of unknowns about SEO: there are experts who are adamanent that certain meta-tags are essential for your blog to do well in search. They may be right. They may have been correct - for a few weeks or even months or years, but some people believe they are not correct now. Others say that meta-tags still matter, because tags, especially description tags, influence what body-text is shown in seach-engine-result-pages (SERPS). But really, only the search-engine makes know the real answer. And even then, their answer may change tomorrow if a new search-algorithm change is applied.
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