I totally agree with you on this,but the question now is ?

How about one who actually have zero or no knowledge about the crypto but have an interest on investing so as to enable Him grow more weather?

I recalled the well-known story of the fisherman. Would you rather buy fish from a fisherman or learn to fish yourself? Expand your knowledge of cryptocurrency. No one is born with perfect knowledge, and learning is a crucial part of human development. Remember that one year of learning and training is more beneficial than blindly investing.

There’s no excuse for this kind of behavior. The knowledge is available for all, you can learn how to trade by watching YouTube videos and reading materials online. There is no reason why you should trust a second party with your funds, many have lost their money to so called professional traders who promise to give them ROI monthly or give paid signals. Don’t fall for the trap, go for the knowledge instead. Here are some articles and links you should read to get started:
Blockchain Books, Bitcoin Movies And Documentaries
https://github.com/bitcoinbook/bitcoinbook
https://bitcoinbook.info/translations-of-mastering-bitcoin
 https://www.coindesk.com/learn

I didn't even trust my parents with my money, how can you trust a stranger.

Oh look, another one who think a professional can multiply his money.

If your friend is a professional trader and can make money from it, he will not have to use other people money since he can grow his own money! trading doesn't require huge amount of money, he can start from small, so if your friend give an excuse he can't trade with small amount money, he's not a trader in the first place.

It is not about the trust you have for your friend but understanding things better for yours. The reason why you don't need to rely on the trust you have on your friend is that your friend can't control the market or make things happen the way you want it. You don't have to do things because you trust your friend,  your friend is human which it is possible for him to take wrong decisions that won't go well with you.  I'll advise you whenever it comes to investment never let anybody to convince you to invest without you knowing about what you are putting your money in.

Make research and understand bitcoin because investment in bitcoin is personal,  you need to make decisions yourself. Investment like cryptocurrency you need to be in charge as to take full responsibility of everything.

No No, you dont trust someone to trade your bitcoin with, at least I would not recommend doing it, even if that person is a very close friend or family. Unless they are your parents or your next of kin, even then it is tough to trust someone in this sphere.

You should learn trading on your own and there are immense number of articles and videos to demonstrate the same. This forum is also very helpful if you need to clarify specifics.

Anyone who has access to your wallet private key can spend your coins, please be wary of that. Secure your wallets and never store the coins on exchange wallets.

The question is if he really can be trusted? Or if you really trust this person because if you feel doubt, I suggest not to continue and better choose exchanges instead.

It was not just the TRUST of our main concern but also the confidence we have that this person ( our friend) can really take the responsibility. Many people get fooled by promises and many people lose their money from trusting a person who never knows how to value the trust we give. .

There is no problem with doing this as long as we know ourselves that this person can give us what we expect from him. But despite this, we should not give full control of our funds still, the major decision is coming from us.

Why don't you learn trading yourself, if you feel you like to trade in the future, instead of putting your trust on your friend to trade for you, and you give him all the vital information that he needs to convert your funds to his.

Trust no one with money to help you do business with it, as long as they have the knowledge mote than you, they will take you to be a fool. The fact is why do you want to benefit from something that you don't know and don't want to learn it on your own to be a master of your own. It is better you don't even think of trading if this is what your are thinking about. Everyone will be held responsible for their own actions, so know what you want.

Op trusting a friend isn't out of place, have seen friends turn brothers and do almost everything together but then it's not really advisable in the area of trading or investing. Trading or investing are attached with significant risks that can result to profiting or loosing which one need to settle down to learn and know what method to go about with.

Trading through your trusted friend with a huge money might not be healthy firstly it might expose you to insecurities, secondly sometimes your friend may run loss, let's say one to three times your friend run loss you might start thinking that your friend is stealing or cheating you even when he is honest and you will see gradually how your beautiful relationship will crash.

It's best to learn and know about trading or investing yourself, then work in course of your study with the method that suit you instead of trading hugely through someone else.