Depends on what type of factory/efficiency you are after.

For speedrunning type efficiency you should watch AntiElitz https://www.youtube.com/watch?v=zBPJBgGLp7s

For design elegance maybe try Nilaus https://www.youtube.com/watch?v=y09-0VB2e8M

Other Youtubers include Xterminator (https://www ...

Just finished factorio half an hour ago, and now tha ive played through it my first time, id love to see a high level playthrough of it, like one that use efficient setups and an effecient buildup to a final factory idea.

Any recommendations?