Having a strong password is important, too. Make sure to use a mix of numbers, punctuation, and letters in both uppercase and lowercase—or a nice, long passphrase. Don’t use the same password (or even a similar one) for multiple accounts, either. Ideally, you should also change your password every few months to stay on the safe side, and invest in a good password manager to keep yourself as secure as possible.
Using a strong password is a good way to protect your YouTube channel and Google account, but it's often not enough. The best way to secure your YouTube and Google account from hackers is to use Google's 2-Step Verification, which utilizes something you know (your password) and something you have (your phone). To login to your account, you'll need to enter both your password and a temporary code that Google sends you via text message or voice call on the phone. I highly recommend you enable 2-Step Verification for your Google account. Here's a step-by-step tutorial on how to enable and setup 2-Step Verification on your Google account and YouTube channel.
If you’re in a place where you don’t really have internet, but you don’t want to use up the data that’s still available on your mobile device you can still get access to the information that you want. Downloading and watching videos can eat away a lot of data from your phone plan or it could take up a whole lot of bandwidth that you really don’t want to be using. Instead, you could have the video already downloaded and ready to play without you having to continue using up the data.
Keeping your account protected may also require a little common sense on your part. Keep an eye out for phishing emails pretending to be from Google asking for your account info, and if you ever find yourself redirected to a random login page check the URL to make sure it’s not a fake page. Two-step verification will protect you from these types of scams most of the time, but you should still try to avoid them.
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If you want to download as videos itself, you can use other free tools like Free Youtube Download to download all videos with a single click. Please be careful while installing this tool as it optionally installs a browser toolbar and modifies search preferences. So please make sure you read and uncheck the optional checkboxes while installing to avoid surprises in your browser.