Ledgers are regarded as one of the best platforms for security. While the risk may be fairly low on a PC with decent security (proper firewall, no malware etc) there are always risks - if an adversary has access to your system and has installed a backdoor and a keylogger they can theoretically get control of your wallet.
If you don’t have a hardware wallet there are other steps you can take to reduce your risk. Cold wallets or Air-gapped machines (no internet connection). If you don’t have a hardware wallet and have a machine with a clean OS install that you are happy to use just as a wallet and only connect it to the internet when you need to spend/receive funds that would also reduce your risk. I am no expert though and Ledgers are kind of the default gold standard for crypto security