For the first challenge we need to do the following:
Find all the matches in the results table where "Hessle" was playing away as the away team and their score was above 18 points.
I emphasized the keywords in the sentence that will help determine what is necessary:
SELECT * FROM results WHERE away_team = "Hessle" AND away_score > 18;
For the second challenge we need to:
Find all users with either the last name "Hinkley" or "Pettit".
We can get the users with a last_name of "Hinkley" or "Pettit" in a few ways:
SELECT * FROM users WHERE last_name = "Hinkley" OR last_name = "Pettit";
SELECT * FROM users WHERE last_name IN ("Hinkley", "Pettit");
This one will return users whose last name is in the provided list of names.