Maybe having a dedicated slack channel would be interesting. Each new message would be pointing to documentation/PR, pinging teams that might find it useful for later use.

We use a private wiki grouping how to's, scripts, guidelines.

Thank you for sharing your experience, I am closing my account. But do you have any similar (or not) service you recommend me to use ? As a student I work with a company through this platform. Thanks by advance

I think going through a more niche platform that has better quality clients and respect for both sides is the way to go.

For example, for WordPress development, Codeable.com is really good - they take care of both clients and developers

For writing, TextBroker or CopyWriterToday might pay more to writers with a better quality control and escrow system.

Designers - if you can get contracted out by Lightboard or others, you'll do much better

It clearly seems better for both sides. Here is a recent thread talking about similar options you gave me https://news.ycombinator.com/item?id=12775983