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Beethoven’s Letters with explanatory notes by Dr. A.C. Kalischer, J.M. Dent & Sons, Ltd., London & Toronto, 1926, pp.393-394

target="_blank" which opens the anchor in a new window(which has been redirected to tabs by browser settings usually)

Instead if this anchor was nested in frames it would open in a sandbox mode of sorts, meaning only in that frame.

What Is Half-Duplex And Full-Duplex Operation, And How Does It Affect Your Router? By Phoon YS Published Sep 22, 2014 Share Share Tweet Email WiFi connections are running at half-duplex while the wired part of the LAN are on full-duplex. So it seems that by connecting through WiFi, something had to give. Were we shortchanged?

Which HTML tag I should use to enclose such notes to add a semantic meaning of a note that may be useful to read at a given point of a tutorial, but is not part of the main tutorial flow?

A better description is in the specification itself. Why read secondary remarks when the source is written so good?

I respectfully disagree with your assessment. You are referencing the quote "It's not appropriate to use the aside element just for parentheticals, since those are part of the main flow of the document." However the OP specifically said that they are looking for a semantic element for "a note that may be useful to read at a given point of a tutorial, but is not part of the main tutorial flow". That is what "aside" is for. It's not part of the main content flow.

An admonition is a parenthetical

<aside> is appropriate if the side note "could be considered separate from the content"

<aside> is not appropriate if the side note is "a parenthetical". The W3C gives no examples of what it means.

In my opinion, the W3C definition is unnecessarily confusing and restrictive. The dictionary definition of aside is "a temporary departure from a main theme or topic", and the spec should just stick to that, rather than introducing subtle distinctions.

I believe the accepted answer is not quite correct. According to the HTML5 working draft, the <aside> element can be used to mark up side notes in certain, but not all cases:

Of course, there is no reason why you can't use <aside> for all sidenotes, if it makes your code simpler. Think of it as civil disobedience. :)

The dictionary definition of aside is "a temporary departure from a main theme or topic"

The biggest drawback of algorithmic feeds is that you might be looking at irrelevant content. When you see something on your timeline and want to comment, you will have to check the timestamp to see if your comment is still relevant or not.