Continuing with my "english workout" plan, another course from Udemy I've recently finished is Master The English Verb Tenses.
2 video hours and 1 audio exercises hour in, it serves as a good way to fortify the english verb tenses. It describes them, including handy timelines to more easily understand when the action took/takes/will take place, gives some examples, scenarios of common mistakes/misuses of each tense, and some exercises for you to do.
Small but effective, it met my expectations.