Is the following sentence grammatical or ungrammatical?

What is your communication style? Knowing how you communicate is essential. Are you authoritative, precise, or spontaneous? In my experience as a teacher, I’ve engaged with leaders and professionals of all background types—from commanding and energetic figures to more introverted thinkers. Self-awareness is where growth begins. Know your style, seek feedback, and keep evolving.

Feedback helps students improve quickly. My lessons focus on practical communication, confidence building, and steady progress tailored to each student's goals. Dr. Osama Farouk from Egypt PHD in EFL English Tutor | | Islamic Studies Instructor on Italki

A wise investment strategy is what you can do consistently. To invest consistently, you should know what you are doing well. If not, you will get anxious easily by ups and downs in price or by bad news, which can lead to bad decisions. So invest in what you know how it works. Or study it before making investment.

Does anyone know any teachers that use the following textbooks: Vitamin Korea, Ask Billy, Anytime Korean or TTMIK. Thank you.

30-day Idiom Challenge #day26

Your authority doesn't 'travel' with you across languages..

30-day Preposition Challenge #day22

DELF / DALF vs TEF / TCF: what is the difference? These four French exams are often confused because they all assess French language skills. However, their objectives and purposes are different. DELF and DALF are French-language diplomas. They certify a level of French from A1 to C2 and demonstrate a candidate’s overall language proficiency. Once obtained, the diploma is valid for life. TEF and TCF are French-language tests. They assess a candidate’s level at a given moment and provide a test result rather than a lifelong diploma. They are frequently used for immigration, nationality, studies, or professional purposes, depending on the specific version of the test and the requirements of the institution or authority concerned.