could somebody very kindly explain to me what this technique is called? are these regular slides?
thank you in advance. please feel free to get me to clarify myself. I don’t really have much vocabulary to ask music theory questions with much precision at this stage.
You could use a slide, but with those note durations, a hammer-on might be easier.
thank you. how do I perform these hammer ons?
for “have you ever seen the rain”, do I sound out fret 3 with my strumming hand then sound out fret 5 with my fretting hand by hammering down?
That’s it exactly!
That’s how I played 96 Tears in my high school band. I played my Farfisa Mini with my right hand and the bass line with my left.
Those are grace notes.
They are short duration notes played before the actual note following them.
How to play them? I usually pluck them, but a hammer-on or slide might work as well. You should make sure you pluck the note following them though
great to pick up music at a young age! I only started after college
pardon the quality of the image. May I get your advice on how you would play this slide from fret 10 to fret 14 given these note durations? should I be sounding both fret 10 and fret 14 out with my strumming hand?
I would also assume that the hammer on technique for fret 12 to 14 is the same as what you have just described to me for “have you ever seen the rain”?
thank you! could you clarify what you mean by “pluck the note following them”? if we look at “have you ever seen the rain” I am referring to my first image, which note are you saying that I should pluck ?
Slide as soon as the first note sounds after you plucked it.
The letters above give an indication on how to play the notes:
The duration of the grace notes should be very short. Depending on the tempo, it might be difficult to pluck the note following the slide. Maybe it will be easier to slide and just let ring.
I see. Pluck fret 10 and just slide to 14 without any additional plucks right?
thank you very much for your help. I appreciate it
ok thank you very much.
These types of “adornments” are always open for interpretation. Notation is just a crutch here…
So, as soon as you know how to play them from a technical point of view, apply your musicality and play them how you “feel” them, keeping in mind the mood of the piece and what else is happening around your line 
can I check for the notation of something like this, given that the first 14th fret note is of a smaller size ( referring to that tiny floating eighth note ), does that signify something?
am I supposed to pluck all 3 notes ( 14th 16th 14th ) or just the first ( 14th ) when sliding front and back or is this a case of whatever “feels” the best?
No, really only the first one; then it’s a very quick slide up and a somewhat slower slide down. It’s notated “legato”, so no plucking after the first
oh! right. yes, that would be the little bow on top that I didn’t pay attention to.
thank you 
Yep, the technical name of which is a “slur”.
got it! thank you 
Good answers all over this thread.
The biggest thing with all of this is - as @joergkutter mentioned - the notation is doing the best it can to try and approximate the physical sounds the player made.
The best way to figure out how to execute these tabs (that always have the potential to be a bit less than perfect) is to listen in to what the recorded line sounds like.
That’s kind of like cheating, but what you’re doing when you’re learning a cover is you’re trying, as best you can, to re-perform something that’s already been done.
It’s like doing a movie quote.
If you just read “No, Luke. I am your father!”
But you don’t do it in a Darth Vader voice, it won’t be right.
You’d be technically right with the words, but the inflection, the tone, the cadence… all of that has to come from the source material.
Same with learning other tunes.
My professor in college was unrelenting in his insistence that I listen to the source material more than I tried to play the cool solos from the transcription books.
I didn’t… and it was always obvious.
So, listen listen listen, and hopefully you’ll make the translation from your ear to the visuals more easily as the sounds get more cemented into your brain.
Welllll… 
