4 ms·
Book of Proof by Hammok is a gentle introduction. As others have said you will likely have to go back further , in which case Kahn Academy has great vidoes, and
by qorrect 4y ago
Book of Proof by Hammok is a gentle introduction. As others have said you will likely have to go back further , in which case Kahn Academy has great vidoes, and MIT has OpenCourseWare which is great when you figure out the names of the things you are missing, and 3blue1brown has incredible videos on a lots of topics.
It will take time so go at your own pace and enjoy yourself!