so I'm on a macbook air .. only 120GB storage of which i have about 1.2gb left.. the yellow other section is 61GB of storage.. I've an external hard drive where I've moved everything i can.. I've run first aid and nothing happened.. i downloaded omnidisk but to be honest I've no idea what to do once its run.. what is safe to delete and what isn't ... I've had the mac over a year and cant afford a new one or to visit apple... help !!!