The Expression of Interest requires your personal details, education qualifications, skills, professional experience. You have to provide a comprehensive details in Skill Select. Your EOI will be processed based on your eligibility and scores are granted accordingly. Highest scored people will be ranked and invited for permanent residency.
There are few programs that require EOI to be submitted in Skill Select
The Skilled visas 189, 190. 489, 457, 186 187 have to be applied for through skill select.