Like in real life, your wallet must be secured. Bitcoin makes it possible to transfer value anywhere in a very easy way and it allows you to be in control of your money. Such great features also come with great security concerns. At the same time, Bitcoin can provide very high levels of security if used correctly.Always remember that it is your responsibility to adopt good practices in order to protect your money.

---

Source: https://bitcoin.org/en/secure-your-wallet

I think the best way to secure your bitcoin is by using a good user authentication toolkit for your electronic wallet. Have you heard of Trust Sum&Substance? I found information about them here:
Trust Sum&Substance’ user authentication toolkit for ICOs to ensure regulations are met and your company is able to stay in compliance while protecting sensitive data. This program can be used with money transfers, electronic wallets and other financial tools to prevent identity theft or unauthorized access of private data. This program works with web and mobile applications and determines authenticity of documents while complying with local and global regulations. Data is encrypted and stored separately from the decryption keys while constant monitoring ensures regular checks are performed on all aspects of the system. This system provides bank-level security while ensuring you continue to achieve maximum conversions. Learn more about Sum&Substance SaaS toolkit through the company website subsum.com or email info@sumsub.com for more information.

The very important security practise is a strong password which is not used on any other website or account. This is the simplest rule, right? But still not everyody understand it's power.

Hey,

The best and most secure way is to use encryption to hide information, and if can handle a piece of paper then that is the safest way because devices can are hackable if not now might be possible in future.