By forming networks. Women can create groups where they can exchange job opportunities, give referrals, and support each other during tough times like layoffs or difficult projects.
They can share knowledge and skills. For example, an experienced woman can mentor a new female colleague, teaching her about office politics and how to handle difficult tasks.
In meetings, women can back each other up. If one woman presents an idea and it's initially dismissed, another can build on it and show its value, which helps to boost the confidence and visibility of all the women in the workplace.