Strong/Semi-Strong/Weak Form Efficient

Good afternoon!

Please can you kindly advise how to clearly identify when any particular scenario is either strong, semi-strong or weak form efficient?

I keep on confusing these concepts despite thinking I have a grip on them sadly!

From my studies, weak form efficient is where haphazard investing transpires, and there is lack of knowledge of the market, Strong form efficient is where everything has been priced into the market therefore upcoming news won’t bare much influence on the market, whereby investors spread risk by investing in blue chip companies, and in a Semi-Strong market only individuals with private/uncommon knowledge can make a significant gain in the market.

Please can you advise whether my logic is correct or if I’m missing something as I can’t seem to identify where I keep on going wrong?

Thank you very much in advance!