I have worked as an HR Administrator (new employee paperwork, benefits paperwork, HRIS updates, promotion/offer letters, etc. more of an HR Assistant). My question relates to further developing my HR knowledge and learning more in other areas of HR s

I have worked as an HR Administrator (new employee paperwork, benefits paperwork, HRIS updates, promotion/offer letters, etc. more of an HR Assistant). My question relates to further developing my HR knowledge and learning more in other areas of HR so I can develop my career. We have a small HR Staff where I work so additional training is difficult as we are so busy with our own daily tasks. My HR Generalist hopes to become my supervisor in December and I am hoping to learn more from her, but its not guaranteed. We recently hired two more employees (benefits coordinator, and position analyst), I was not qualified to fill either position since I am so new to the field. How can I learn more about each area of HR since I am not able to work 'hands on'? Are there books I can read? I have a BS in Management of Human Resources. Thank you.