I recently bought a basic external monitor (LG) that came with a DVI cable. I was able to hook up this up to the HDMI port of my MacBook Pro 13” (early 2015). However, when I tried hooking it up to my friend’s MacBook Air (2017) I realised that the Air doesn’t have an HDMI port, and I’ll have to get a connector that has a Thunderbolt port connector at one end. I looked around on the Apple website and I am not sure which connector to get. Can you suggest which connector to get - both an expensive one, and a cheaper option from one of the third party manufacturers? Thanks!