Things we need to avoid while storing the Private keys are -
- Never print on a paper or take a photo of a seed.
We can store the seed using a paper wallet, the cheapest, and the best way to hide the seed.
How can you claim that storing the seed printed on paper is insecure, while at the same time recommending a paper wallet?
If you print your seed on a paper, it may leave a file on the system(PC or Laptop) where you are printing which is not safe. Writing seed on a paper using a pen is also safe.
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I have just added a note that we need to avoid a few things before thinking about how to store the private keys securely.