There is somewhat of a challenge when first starting Crowdflower tasks. Once you get used to them they are easy to churn out. As you can see from the task ticker, they are one of the major point sources for many people. I cherry pick the tasks that I know are easy and not broken.

The newest ones available " find the search engine ranking for 3 keywords "
is super easy and only takes a few minutes.

Break the Catcpha hero (only available occasionally) is very simple too.

Sometimes they will require a quiz mode before actually doing the work but if you pass the quiz you get paid for that too!