You can find initial information on self-management and time management here. The student trainer pool at h_da also provides suggestions for coping with stress (course "Stress Management" and podcast "Trainerpool2Go").

Structure is helpful, but not everything. Leisure activities and (targeted) relaxation help you to cope better with challenges in your everyday life and course outline. You can only remain resilient if you cultivate your resources. Various relaxation techniques can help with this. Some of them are presented and instructed here, by video or audio.

Note: Relaxation techniques work particularly well if they are practised regularly and thus become routine. It is completely normal that many things feel unfamiliar at the beginning or that the effect does not materialise immediately. And as with so many things, the same applies here: Pick the exercises that suit you and that you have entry requirements for! Relaxation cannot be forced.