Spanish is (as of 6th March, 2022) the third most widely-spoken language. It's a level one language and closely related to other Romance languages.
Courses:
Spanish in three months
Spanish for dummies
Duolingo
FSI Spanish
Miscellaneous:
Spanishpod101
Easy languages
https://attachments.convertkitcdnn.com/148591/275c208b-25bd-4b35-96a1-a15e57d0b515/Duolingo%20Spanish%20Vocab%20List%20PDF%202.0%20-%20Spanish%20Duo%20List%20(Spanish%20Duolingo%20Memrise%20Course).pdf
http://joyoflanguages.com/the-11-best-tools-for-learning-spanish-from-beginner-to-advanced/
http://joyoflanguages.com/improve-listening-foreign-language/
Spanish GCSE with aqua
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Study resources
Non-Fiction-contains the necessary resources for self-learning certain languages, pre-experience not neccesary- it's being modified into a study resource hub rather than focusing on languages.