Questions about HP Pavilion 15-ck080nz

Hello the processor has a base speed of 1.8 Ghz. But can go up to 4Ghz https://ark.intel.com/products/122589/Intel-Core-i7-8550U-Processor-8M-Cache-up-to-4_00-GHz

As far as I know, eGPU's (external GPU) do not work on HP laptops.

OK, I have since found out myself (FHD IPS BrightView display). So not anti-reflective

No. I cannot see any pixel rows.

USB-C is the advanced version of USB 3.1. if you connect a graphics adapter to USB-C, your computer will also support it. USB-C is better than USB3.1, no problem to connect another screen.

No. The notebook has only one HDMI connection.

You can replace the M.2 SSD, but at your own risk (possible loss of warranty).

It has a backlit keyboard: http://store.hp.com/SwitzerlandStore/Merch/Product.aspx?id=2QF49EA&opt=UUZ&sel=NTB&gclid=EAIaIQobChMIlIiOxZ7h1wIVExsYCh2ZBQlmEAAYASAAEgK6IfD_BwE&gclsrc=aw.ds&dclid=CO-ZrMqe4dcCFaEg0wodcrwAaA