VPN
A personal favourite and must-have, depending on your requirements. If you will need to connect to your bank, PayPal, download anything from the App Store (iPhone), buy anything online from back home (e.g. mum’s birthday card that you forgot to post), download Netflix shows, or use AirBnB for accommodation/Experience/Adventure etc, you will need a VPN.
For a decent VPN you will need to pay, and the quality depends on the price. I use ExpressVPN and I can have it connected on 5 devices at the same time. It’s the only way I’m able to check my UK bank, use PayPal/Spotify/Netflix etc etc. It’s worth the money.