Dear EpicNoob1
Thanks for reaching out! I'm an Independent Advisor and a Microsoft user like you. I will be happy to assist you in this regard.
It would be safe only if you have a good security software installed on your computer and have a strong firewall policy or you are aware of using internet that do not open a suspicious links.
However, I will provide you with some tips to store your passwords safely:
1-If you have a good memory, the safest place to store your passwords is your mind.
2-You can write down your passwords on a paper and store the hardcopy of it on your room or office.
3-You can save your passwords as a note on your mobile phone.
4-you can store the passwords on a cloud storage like OneDrive
5-If you have a reliable email address like Hotmail or Outlook, you can send the passwords to yourself.
6-If you want to keep your password on your computer, put the Word file on Zip file using a Zip tool like WinRAR and set a password for the created zip file.
7-Refrainf from using a third-party software that used for storing passwords.
Please let me know if you need further assistance and keep me updated.