Source: https://monero.graphics/all/always-the-hidden-poket/

wallet-anonymity Pro-Tip:

• download Tails OS
• boot it from USB stick or SD card
• download Monero GUI using Tails Tor Browser
• open Monero GUI settings, set a .onion Tor Node
• create new seed and wallet address
• write down this seed carefully
• send your XMR there

example for a good Tor Node (hashvault-pool)

• hashvaultsvg2rinvxz7kos77hdfm6zrd5yco3tx2yh2linsmusfwyad.onion:18081