Great thread!
I am not sure if these qualify, but they are just some tips on things I found useful:
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When you’ve decided on using a new technology, read a book or two about it. I’ve found it incredibly beneficial getting a good overview of what’s possible with a language or framework as it helps you picture how you could use it. Doesn’t matter if you don’t remember every little detail, you’ll be able to find the details when you need them. (I’ve stolen this last bit from @chrispine and his Learn to Program (2nd edition) (PragProg) book - he made me feel completely fine about not remembering everything!)
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Find a language, framework or tech that you enjoy using - we generally excel at things when we enjoy them. Also means you’ll be less likely to get bored or burnt out.
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Don’t worry about asking questions or appearing like you don’t know something - because it helps others, both by the answers you might get to the questions you ask but also by showing others it’s ok not to know something, or that you have experience with something (when it appears everyone else might!) or even that you are struggling to grok something. This can help others who may be feeling similarly, but also could help language and framework maintainers improve their projects, docs etc