When advising someone concerning a good digital currency for investment it's best to advice the person to focus on the one that's more decentralized, Bitcoin is the best amongst all that suits that description, no other ones come close to it, even though some people do feel their are good alternatives for investment but none have been more secured like Bitcoin.
Anyways Bitcoin investment is not for everyone it's for those who have hope in it and believe that If they can remain calm and patient while accumulating it continuesly they'll get better reward in the future, although some people still choose to risk on other coins asides Bitcoin but the best coin for investment is Bitcoin and no other.
You should never advise anyone to invest. Because if you tell your friend to invest in Bitcoin and if he invests in Bitcoin and after a few days the price of Bitcoin decreases, then he will get very scared and then that person may sell his holding. Then he will put the entire blame for this loss on you. Because you gave him advice.
This is exactly what happened to one of my friends: A friend of mine invested in Bitcoin. He told a friend in his office about his investment, will you do it? He asked his friend to invest directly without saying anything about the risk etc. A few days after investing, suddenly there was a fall in the market and when the new person saw that his investment was losing money, he sold his entire investment. The entire amount of money he had lost was completely blamed on my friend and he had to pay full compensation. So you should never advise anyone to invest. If a person comes to you to learn something about investing, you can tell him the basic knowledge about Bitcoin and show him some videos and say, "This will be useful for you."
There is nothing bad in it if you advise a brother to invest in bitcoin it is now their own choice to accept or not.
Before any advise you might told them how bitcoin investment works the nature of the market, the up and down of the price so they will not panic when such thing occur, that it is also a long term investment and when investing to invest using their discretionary income which is money they can afford to loss, they may not happy with you if you start benefiting from your bitcoin investment for not letting them know before now it is of a true that no time is late to start buying bitcoin but it will be better to be done now.
Yes, if you want to introduce someone to Bitcoin, then you should only advise them, do not force them to invest, and do not only tell them the positive aspects, but tell them all the things, that is, so that someone does not invest by knowing only the positive aspects, but after knowing about the risks and accepting all the things, they invest at their own risk. If you only tempt someone to invest by telling them the positive aspects, then ultimately you are forcing them to invest. Which should never be done. An investment should always be made according to one's ability and from additional income, but if someone invests without fully knowing the things, then he will never be able to maintain his investment properly. Therefore, when giving advice to someone, one must clearly explain all the issues. Only if the investor is able to take this risk and can do everything correctly, should he invest. And one must understand that even if he does everything correctly, he will never be guaranteed success, he will only be able to achieve a good chance of success. Therefore, one must acquire the right knowledge and then decide to invest.