What are the 30 most commonly used words in spanish?

It's difficult to definitively say the most common 30 words in Spanish, as it depends on the context (written vs. spoken, formal vs. informal, etc.) and the source of data. However, here is a list of 30 very common Spanish words based on various sources and incorporating different aspects of the language:

Articles and Determiners:

1. el (the masculine)

2. la (the feminine)

3. los (the masculine plural)

4. las (the feminine plural)

5. un (a masculine)

6. una (a feminine)

7. de (of, from)

Prepositions:

8. en (in, on)

9. con (with)

10. para (for)

11. a (to, at)

12. por (by, for)

13. sobre (on, about)

14. sin (without)

Pronouns:

15. yo (I)

16. tú (you)

17. él (he)

18. ella (she)

19. nosotros (we)

20. vosotros (you, informal plural)

21. ustedes (you, formal plural)

22. ellos (they, masculine)

23. ellas (they, feminine)

Verbs:

24. ser (to be)

25. estar (to be, in a state)

26. tener (to have)

27. hacer (to do, to make)

28. decir (to say, to tell)

Adjectives:

29. bueno (good)

30. mal (bad)

Note: This is not an exhaustive list, and the order is not necessarily indicative of frequency. Many other common words exist, such as "que" (that), "como" (like), "porque" (because), and "no" (no).

For a more specific and accurate list, you can explore resources like the Spanish Word Frequency List or Corpus del Español which analyze large amounts of text to determine word frequency.