Is it safe to use public WiFi when accessing my crypto wallet?

Reading balances is fine. Signing transactions on hostile networks is meaningfully more risky — not because of the WiFi itself (HTTPS protects the connection) but because public networks make DNS hijacking and SSL-stripping easier on poorly configured devices.

Reasonable rule: read on public WiFi, sign on trusted networks. If you must sign on public WiFi, use a hardware wallet (the private key never leaves the device, so a compromised network can't extract it) and double-check the destination address on the device screen.