So I'm moving from AR v3.8.4 to the latest version and the whole system seems to have been changed.

So on version 3 I used to have a setup where players would start as Newbie and then after doing a certain amount of tasks determined in the advancedconfig.yml they would rank up, until they were the highest rank and couldn't rank up anymore.

How can I do this on AR 4.x Does each "path" correlate to one rank change in the old advancedconfig.yml. So would I have to just make it so that there's "paths" from each rank to the next so that they're always auto-chosen once the last one has been finished.

I've attached my advancedconfig as a txt file if it helps understand
AdvancedConfig.txt

Yes, I think you are on the right track. Try playing around with the paths file and I can provide you with some feedback.

I've written extensive tutorials on the wiki of Autorank, but this is the gist of it:

A path can be used to perform certain results when requirements are set up. For example, you can rank a player from rank A to rank B when he is in rank A, has walked 1000 blocks and played for at least 10 hours.

For more info, please use the wiki!

So essentially it works like I thought, or am I missing something?

I've written extensive tutorials on the wiki of Autorank,

I don't think it is as extensive as you believe it is. For example, you give no examples at all in this page for any results other then giving out money. Is there some listing of all the possible results a person can use? In a converted file I see a command as one, is there a way to trigger off a series of commands? Can you accept an array under the commands node? We really need you to provide a lot more documentation and variety in your examples.