To clarify, when you say freelancer, do you mean on a part-time basis? Or do you mean having a contract and working on a full-time basis for that client? Also, where are you based? I'm happy to give advice as a UK based contractor, who does a tiny bit of freelance work
8
Mastering default values in JavaScript with the nullish coalescing (??) operator - Matt Smith
(allthingssmitty.com)
When I say a conference, here's an example of what I mean, State of the Browser 14.