My tools for working from home
- a good wifi connection, I personally use Ubiquiti Unifi APs which has made wifi coverage throughout the home a non-issue
- a good chair! Can't afford the Aeron they used at the office but the cheaper alternatives isn't bad
- I'll second the recommendations for a comfortable headset, I still fall back to my trusty Bose QC20 which works reasonably well

The company I'm working with is based in Hong Kong and had to deal with thousands of employees working from home since February and during a few weeks in 2019, I'm happy that the VPN infrastructure survived...