Using safe hardware
If you really want to be safe on the networks it should start with a trustworthy computer. Go get these things:
1. A crappy used computer with a big HD. It does not need speed or big memory or anything fancy. It doesn't even need a dedicated monitor. I can find a computer like this for free to $150. An old office or family PC with a HD upgrade works well.
2. Create a Linux install disc, an "ISO disc". You probably already have the tools to do this on your computer. The Linux OS is a far better choice for security. If you are new to Linux you may want to download Ubuntu. It's free, secure, and very easy to use. Even if you are completely new to installing an operating system you will be able to do it. Besides, if you mess up just start again.
https://www.ubuntu.com/ https://en.wikipedia.org/wiki/Ubuntu_%28operating_system%293. Install only the minimum software to get it stable online then install a bitcoin node wallet like Core. Perhaps it is worth downloading trusted VPN software also. But lie if they ask who you are and only pay in bitcoin. They don't kneed to know who you are to do their job. Select to only apply Ubuntu "security updates" and do install them as they are released. For added security you can compile bitcoin Core locally from source code. If new to all this then download from the most trusted sources.
https://bitcoin.org/en/downloadhttps://www.privateinternetaccess.com/4. Now turn it on, run your wallet and forget about it. This is your wallet now, not a computer. I would not surf the web or use it for anything else. Just keep it synced for when you want to move your money. If you buy something online you will be presented with a public key to pay. But any computer anywhere can pay that address, so you can plug in a monitor and use your wallet/computer. It will offer full blockchain security and will already be synced. And watching your shopping computer will not help an attacker get to your wallet.
Keep in mind that you can throw away all this high security by:
Downloading compromised or malicious software
Telling people your passwords
Writing your passwords on the bottom of your keyboard
Failing to make backups of your wallet - An absolute must!
Hope this helps!