Where can I practice English by topic?

Question

English learning tools

The bottom line is this: We need a site (s), maybe a book where you can practice English on topics. After studying a topic, everything seems to be clear and understandable, and you remember everything, but time passes, and everything is forgotten without practice.
Tell me, please, who is struggling with this problem.
Example: I studied Present Simple and now I need practice (tests, exercises with answers, etc.)

Answer 1

Watch what you are interested in, for example, laracast. Or other lessons in English.
Double benefit

Answer 2

If you need grammar, then you can take a course from Lingualeo , almost all grammar rules are described there + training after each of them and at the end of the test. There are a lot of usage examples, and after completing the course, you can train the same rules in the grammar simulator (build sentences of a certain tense)

Answer 3

In order not to forget - you need daily practice. At least for ten minutes or half an hour, but every day.
There is a very good trainer on topics at duolingo.com. You can train individual topics, or you can train all previously completed ones. If something is not clear, then for each pair of sentences there are comments from users and moderators, where a lot has already been explained. I was very good at pulling up some problem areas thanks to this project.