What does sol mean among general skilled immigrants in Australia?

General skilled immigrants must complete their job search on SOL, otherwise they can also apply for Australian employer-sponsored immigration; You can apply for Australian employer-sponsored immigration if you meet the following conditions: under 50 years old; College degree or above; 6 points for each IELTS (some IELTS can be exempted from the exam); Engaged in professional work for more than 3 years. Employers guarantee that immigrants do not need to score points, and the conditions are relatively simple, and they live directly and permanently.