Additive transitions

Additive transitions signal to the reader that you are adding to an idea and/or your ideas are similar. Here is the list of most of them:

indeed	in the first place	and	or
too	nor	further	moreover
furthermore	in fact	let alone	alternatively
as well (as this)	what is more	in addition (to this)	actually
much less	on the other hand	either (neither)	as a matter of fact
besides (this)	to say nothing of	additionally	not to mention (this)
not only (this) but also (that) as well	in all honesty	to tell the truth

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What is the difference between beside and besides:  

Let's study them through examples.

The use of beside:  

Beside is a prepostion. This is the pronunciation: UK /bɪˈsaɪd/ US  /bɪˈsaɪd/

at the side of, nexto to: 

Examples

• Tom's parents kept vigil beside his bed for weeks before he died.
• I keep a flashlight beside my bed.

- to be in no way connected to the subject that is being discussed:

- unconnected, irrelevant

- out of your senses (figurative) 

Examples

• Let's stick to discussing whether the road should be built at all. The exact cost is beside the point.
• Whether or not he's married is beside the point.
• My mother was beside herself with worry when I didn't call.

What is the difference between BESIDE and besides:  

THE USE OF BESIDEs:  

Besides is an adverb, and it is the synonym of the following expressions:

Examples:

also:  It's a nice day for a walk, and besides, I need the exercise. 

as well: I'd like to have a nice car, and a whole lot more besides. 

other than, except: There's no body at home besides me and the cat.   

as well as: Besides money, Raddy also wanted a job.

in addition to: I don't like apples, besides wich, I'm allergic to them.

otherwise, else: I have washed the dishes but nothing else besides.  

References:

1. ToughtCo. (n.d). Complete list of transition words. Retrieved from: https://www.thoughtco.com/list-of-transition-words-1857002
2. Cambridge Dictionary. (  ) beside. Retrieved from: https://dictionary.cambridge.org/es/diccionario/ingles/beside
3. Wordreference. (2021). Beside/besides. Retrieved from:  https://www.wordreference.com/es/translation.asp?tranword=beside