I think the laptop comes with 4gb soldered and only a 4 or 8gb upgrade is possible.
A ram upgrade is very worthwhile so long as you are using a 64 bit version of windows and not 32 bit.
Here is a link to crucial:
https://www.crucial.com/compatible-...DZo7Pn7gIVh_bjBx0SbwHKEAAYASAAEgKE8vD_BwE:G:s
Your current 4gb must operate in slower single channel mode.
Adding ram will allow faster dual channel mode.
With 8gb more, the first 8gb will operate in single channel mode and the odd 4gb will be in single channel mode.
More ram is better so don't worry about that which is called flex mode.
I would put a ssd at the top of my upgrade list.
It makes everything you do much quicker.
Likely, a more significant upgrade than the ram upgrade.
Here is a video on how to do an upgrade:
View: https://www.youtube.com/watch?v=iOdNYXGyBOM
The ram is trivial.
Adding a m.2 ssd requires a decision.
If all you want is extra ssd space, it is simple, just install the m.2
But, if you want to see everyday performance improvement, you need to have windows on the ssd.
Here is the simple way:
Buy a samsung 860 ssd.
It needs to be at least as large as the used capacity of the current hdd.
1tb will be about $100, 500gb half that.
Also buy a usb to sata adapter cable, about $10.
Down load the ssd migration app and user instructions.
Download various software related to your product, including Samsung Magician, designed for use with Samsung's memory products, and find related information.
www.samsung.com
You run the app which copies the C drive to the usb attached ssd.
When done, swap the ssd for the hdd.
Set the hdd aside in case you ever need to recover the laptop to factory specs.
Upgrading to m.2 ssd is similarly possible but it is more expensive, and the performance difference is minor.