Lingolia is a reference site that supports you in understanding grammar, vocabulary, spelling, and punctuation for school or work; it can be used as a tool to support your language studies when you require clearer explanations of these concepts. English and German are currently the only languages that contain additional sections on vocabulary with listening and reading exercises, although it’s possible that the Spanish and French sections will develop these in the future.
Each page provides a simple explanation of your chosen topic, and then an exercise (or more if you get the premium plan) to practice your comprehension. The best part about the exercises is that they give you immediate feedback about whether or not your response was correct, providing you with the opportunity to reflect on your mistake and correct it. If you don’t want to invest in a premium plan, you can use Lingolia’s free exercises and then check out other resources that provide similar exercises for free, such as SpanishDict or Conjuguemos.
Unfortunately, there is no audio on the site to train pronunciation, but Lingolia does seem to fulfill its mission of providing simple explanations to support your learning.