A common method used for creating a strong random password is to turn a sentence that you can easily remember and turn into a password by using the first letter of each word, parts of words, substituting numbers and symbols as appropriate. Choose phrases that are meaningful to you or includes your favorite hobby or sport to help you remember.
For example, my phrase might be:
Rush Hour 3 is my favorite movie and I like chocolate might become rH/3iMfm&1Lchoc
or
I love football and cricket could become iLuVfb&CiK3t
Waters, Sue. “Tips for Creating Secure Student Passwords.” The EduBlogger, 22 Apr. 2014, https://www.theedublogger.com/tips-for-creating-secure-student-passwords/.