hannsen

all cardinality unlimited fields:          entity->field->getValue()
all referenced entites:                         entity->field->referencedEntities()
one referenced entity:                        entity->field->entity
value of field:                                        entity->field->value
entity reference id of field:                 entity->field->target_id
load entity by id:                                  Entity::load(id)
load multiple entites by id:                 Entity::loadMultiple([ids])

clear cache:                 \Drupal::service('page_cache_kill_switch')->trigger();
get tabellen name of entity:  ->getEntityType()->getDataTable()