We recommend that before investing in bitcoin our funds are free funds are not loan funds, and also you must be prepared, not a few people who will invest in bitcoin will panic if prices go down, but for me personally I am very optimistic to see the bitcoin movement going forward, we know that bitcoin had penetrated above $ 25,000 last year and hoped to repeat itself

wrong. there are 3 types. bitcoin, good or decent alternative cryptocurrencies, and then shitcoins.
the shitcoins are used by traders to make profit on their bitcoins that is why you see them as "dominated by bitcoin" it is because people dump them immediately when they see bitcoin move.
the decent altcoins are always overshadowed by these shitcoins because the shitcoins get all the pump and dumps and hide the good coins by pushing them to the bottom of the lists.

wrong again.
bitcoin has not been in a bubble for at least 6 months now.

not to mention that you are just contradicting yourself in the second part. you say here that bitcoin is a bubble then continue to advise people to invest in bitcoin! if you truly think something is in a bubble then you shouldn't be investing in it until its bubble pops.

Yeah, I think bitcoin is best choice for invest long term, That's if you have enough money for buy it. But I trust bitcoin will not die. Because if bitcoin die what will happen to another currency like altcoin? Or what will effect to physical money like dollar?

For many simply using a buy and hold strategy is the best option. It may not maximise potential returns but it's always a balance between risk, effort and reward. Every person who's bought and hold bitcoin before 2017 is in a profit, I do sincerely believe in some years time we'll be able to look back and say the same is true beyond 2017.

I would prefer you use the word, price correction than using bubble. The market plummeted and this is affecting every coin in the market. Bitcoin is virtually the safest bet in this market now. Invest into bitcoin today and possibly trade altcoins

I think its really brave of you to categorize cryptocurrency into bitcoin and shitcoins asdnguyenthanhtin!

Imagine the number of top altcoins out there who were decently put up by thinkers in bid to smartly disrupt tech process, idealogies and frame of work just to be called shitcoins by you. And you even strongly mentioned "ETH" as one of them when the founder has been a regular guest speaker on blockchain conventions all over the world and is among the trusted names when it comes to cryptocurrencies.

Harsh, really harsh. True, the world of altcoins has been plagued with token & coins that seems to be instantly invaluable nor useful in just a short span of time. But some did stood the test of time and usability and has proven their worth in both trading and investment.

I'd suggest you be a bit more smart and wise in your choice of words, it only makes the world of cryptocurrency more shitty as much as you hate shitcoins. And that's a sincere suggestion from my end. Take it positively.

If you want a short-term investment, look at prices that are really precise and see information that many investors will buy the coins. That's one way to get profits in the near future.

But all in investment is risk.

I'd love to see a Pros/Cons of people who were experienced investor. 

you can not call "short term" an investment.

short term is purely trading related which can even be referred to as day trading. in short term you can find even shitcoins are profitable because they get pumped. but the long term only belongs to something with a real future not an altcoin that is filled with fake advertisement and pump and dumps.

For me, it is the best idea. If you invest here on bitcoin you can earn more money also your money is secure. You can save money while waiting for your campaign. Investing is very profitable so it is one of the best way to earn more money.