It is difficult to say which one is the best to start learning about crypto but if I have to recommend you something to start with. Yes, it is the site:
https://bitcoin.org/en/ and the
Bitcoin's whitepaper (you can choose relevant translations of the Whitepaper for your interests).
Why I recommend them first for you?
Because cryptography has a very very long history but bitcoin is the first one that actually made a revolution for cryptography and brought it to the world population on massive scale.
If you want to move further, from basic to advanced, you can find what you need here:
Available courses on Bitcoin and Blockchain Technology from colleges and Universities. Remember to learn how to use keywords to search newest courses on those given sites in my thread (I could miss some newest courses).
In crypto, as the saying goes "Not your private keys, not your bitcoin; not your seeds, not your coins". Hence I emphasize the importance of managing basic (basic, not advanced) to install crypto wallets (bitcoin or altcoins), backup (private keys, seeds, etc.), recover wallets from backups.
Storing your coins on exchanges is the worst thing to do in crypto. Relates to crypto exchanges, you have to manage to activate 2-factor authentication, backup 2FA code, and recover your 2FA code on your other phones.
Passwords are very important in crypto, so let learn it in your very early days in crypto:
[GUIDE] How to Create a Strong/Secure PasswordTemporary emails
[1] are good (and you should use them) if you want to register on newborn sites or ones you don't sure it is a legit and reliable one.
There are more advanced and private emails, like Proton mails (but sure you have to pay cost for them). Proton mail has till discounted 50%.
[2][1] https://mashtips.com/disposable-email-services/[2] ProtonMail black friday is on!Phishing attacks are the next ones you must learn to protect your funds, so read:
[LEARN] Phishing Quizzes - Beginners & Experts.
Scam:
List of (un)known methods scammers user to scam users with honorable mentionDon't instantly download anything you see:
Guide and advice for new Users before you Download anything from the Forum ! (and outside the forum too).
If you need to find something, find them here:
https://bitcointalk.org/index.php?action=searchRead that one too:
A Complete Guideline to use forum search button properlyLastly, I congratulate you for choosing the right forum to begin your interesting journey with crypto.
I believe I gave you enough sources to start off, from them you can find more related things if you want.