Looking to adding more RAM but cannot find compatible module

According to this code:
HP Laptop 15-da0xxx 4BA37EA#ABU, you have an HP Notebook - 15-da0997na

According to Crucial:
Memory RAM & SSD Upgrades | hp - compaq | hp 15 series | HP 15-da0997na | Crucial.com

It's got 1 slot, 8 GB max.

NavyLCDR said:

According to this code:
HP Laptop 15-da0xxx 4BA37EA#ABU, you have an HP Notebook - 15-da0997na

According to Crucial:
Memory RAM & SSD Upgrades | hp - compaq | hp 15 series | HP 15-da0997na | Crucial.com

It's got 1 slot, 8 GB max.

Thanks Navy.
So this limits the options to one 8g stick.
scopio, you've done the best choice. Sorry for the "inquisition".

Thanks @Megahertz for your suggestions I wasn't sure about how many memory slots this laptop has either, it is not my laptop it belongs to someone else and I have had to get information of it by remote which is not ideal.

I have to say it is not the most useful laptop on earth!

Thanks @NavyLCDR for confirming this laptop has only one slot and confirming that the Crucial CT8G4SFS8266 8 GB (DDR4, 2666 MT/s, PC4-21300, Single Rank x8, SODIMM, 260-Pin) Memory: Amazon.co.uk: Computers & Accessories is suitable for this laptop

NavyLCDR said:

According to this code:
HP Laptop 15-da0xxx 4BA37EA#ABU, you have an HP Notebook - 15-da0997na

According to Crucial:
Memory RAM & SSD Upgrades | hp - compaq | hp 15 series | HP 15-da0997na | Crucial.com

It's got 1 slot, 8 GB max.

One oddity: if you scroll down the Crucial page, it lists a couple of 16GB (2 X 8 GB) kits. I think that the 1 DIMM slot thing is real, though.