What is included in the concept of basic knowledge of the frontend for a junior in backend development?

Question

Frontend

Good afternoon, dear Khabrovites!

I recently decided to switch to python backend developer. Based on the requirements in vacancies and all kinds of roadmaps, basic knowledge of the frontend is required. I would like to ask experienced developers: how deep should such knowledge be for a junior backend development? General knowledge is needed, what is applied where and at what stage? Or, in addition to python and sql, do you need to be able to code in css, html and JavaScript?

Thank you in advance for your response !