When you have a problem, and you come across a framework to solve it, how do you onboard to that framework?
(for instance, imagine some Sinatra-like web framework which could be in any programming language -- the deep complexity is in the nature of http for which your past experience is portable...)
If the above are missing you look to remediations such as: maybe reading the source code is better than the reading to docs, intensive training in the subject (i challenged myself to make a print a day and now I have a pile of burned out thermal printers, samples of every industrial adhesive I could find, and walls covered with photo prints and anime art), doing a pilot project to scout risks (e.g. build an instance bigger than prod will be on day four), etc.
Also: frequently the "onboarding" is to a system that already uses the framework. For instance, this is how React found me. Then thinking hard about the problem of "how do I update the UI when I receive data from the server?" did pilot projects in Vue and MobX-React.