Free and Open Source software. I don’t mean anything specific, but if you use/need software it doesn’t hurt to search if there are any FOSS solutions available that suit your needs. If it does, you might save a couple of bucks. If it doesn’t you can still use your proprietary solution anyway.
Stuff from your job. If you’re not stealing from your employer, you’re stealing from your family.
Username checks all the way out lmao. But ya I agree fully 100%.
Piracy
Wonderfully formatted ebooks derived from Project Gutenberg.
The many thousands of free ebooks at Project Gutenberg and on other sites like it.
Their local library’s online resources. Especially if they are in a large city here in the states. Most offer general digital resources, some offer free digital magazines, some offer digital classes, it just kinda depends. It isn’t just books and audiobooks.
Kahn Academy. Best education money can buy, and doesn’t require money.