I believe most people think the same way because it's just simply BUY or SELL and as long as you have internet, that's easy. When you want to achieve profit, they thought simply buying a course from internet and they become expert in couple months time. I am 15 years in financial world including stocks, bond, derivatives, CDS, CDO and my best expertise in Exotic Options and Structure Notes which most retails trader didn't even heard before. Most of my friend always ask me the same question and I always will give 1 advise, don't even try unless you are willing to put 5-10 years in before even thinking about consistency profit. You are consider great if you can in BE position after 3 years of trading. Simply think this way, a professional trader earns more than a doctor or lawyer. Do you think they can become a doctor or lawyer in 3 months time? Sorry for telling the truth but that's the real situation in trading world. You are going a battlefield against all other experts with far more experience and high-technology equipment, never think it's easy to get into trading if you are not going to put in a lot, I mean lots of effort.
That's truth, I wanted to just correct that "clicking buy and sell" is not the question here, that is not what is being asked. Just like you said trading requires a lot of time, I do not know how many years or so, thankfully I have been only trading in crypto and not traded other things too much (just a bit of stocks purchased but that wasn't trading, I just bought them and hold them) and I can say that I have been quite successful since early days because all I do is just buy and hold, that's me, I do not trade.
If someone wants to day trade for example, you need to be spending a lot of time to learn and just like you said it is something that takes over ad decade to be consistently profiting from it. Hence, I think "anyone can buy and sell as long as they have a PC and internet connection" is not what is being asked here, that is obvious and nobody would ask that.
Yes, investing and trading has different definitions, unfortunately most people couldn't differentiate it. When buying and hold, you just need to have positive outlook on certain products, that's call investing. I am pretty sure the question was "Trading without knowledge and experience" instead of "Trading Profitably Without Knowledge and Experience". So I think I gave the most nearest answer which is, "Yes, as long as you understand what is BUY and SELL, with internet connection, then you are good to go". If someone with common sense and really serious for getting more in depth into trading, this is not the correct question to ask. This question is similar to "Can I fly a plane and become pilot before going for my PPL or CPL License". You can't fly a plane without PPL license but you obviously can simply click BUY and SELL without knowledge and experience.