What Is The Correct Way To Express A Path In Order To Get Pelican Generated Html To Link To An Image?

I'm just starting to create a blog with Pelican and wanted to link to an image. I did this by including the following line in my Markdown file: STATIC_PATHS = ['images', 'files'] # add any no. of locations # ...

In that case, when Pelican is building actual page, it will look for any referenced static file in ./content/images and ./content/files locations. If cannot find there, it will emit the error message.

Now, answering to your trouble ...

By,

... src="./myImg1a.png" ...

Pelican look for this myImg1a.png file in your myBlog/content/ folder as you are mentioning ./ which is the root folder for Pelican is working on.

But, when you are referring it as

... src="/myImg1a.png" ...

Pelican eventually finds it in the html file's directory. By getting / as location, Pelican is looking for it in the same directory of your myblog/my-blog-post/index.html which is myblog/my-blog-post/.
Hence, working. But not in the ideal way.

For a deeper understanding, please take a look into Pelican's documentation on this matter.

2. Why was the folder /category/myImg1a.png/index.html being sought at all?

Pelican, here, just trying to be smart.