I saw something about not copying and pasting your private key and I want to add something to that... If you must copy and paste your private key, never use third party keyboards, always ensure that you use only Google keyboards in your devices.
You will be fine if your devices (computers, laptops, mobiles) are safe and not infected. I have one thing to add here. You should not store your private keys, passwords, and important things online, on cloud storage services. They are unsafe, in my opinion. Sometimes sychronisation help you feel more convenient, and save time, but this process is unsafe too. I try to avoid using them.