These are the mostly free resources that I use for my affiliate marketing business.
Submit your site to the search engines
https://www.freewebsubmission.com/cgi-bin/submit-async.cgi#
https://www.bing.com/toolbox/webmaster/
https://search.google.com/search-console?
Free images
https://unsplash.com/s/photos
https://www.scx.hu/
Free image maker
https://www.online-image-editor.com/
Free plagiarism checker
https://smallseotools.com/plagiarism-checker/
Free word search tool
https://www.wordhippo.com/what-is/another-word-for/perform_surgery.html
Free keyword tool
https://neilpatel.com/ubersuggest/
Free domain authority checker
https://www.wordhippo.com/what-is/another-word-for/perform_surgery.html