All 3 of them are the very good option to invest but the main thing is that Real Estate requires a lot of money to invest and the stock market is slow in giving profit Altcoins are new and can give good profit in short term that is why I invest in Altcoins.

I think invest in altcoins mean support their project, if you trust their project can give impact to the world or the project can make you get a lot of profit in the future, you can join the ico or their funding. We need to always support the project because it will make cryptocurrency develop more and more

My opinion, Altcoin is smart investment for short and long term. You can investment good altcoin and earn big profit in short term. But it's risky when you can investment without read whitepaper, roadmab, website. So you can check every details of ICOs. after that you can investment. I hope you can earn Big profit.

I think, There are several advantages to investing in digital currency. Digital currency is still a little-known business, some investors. Short, medium or long term investments are enough to save savings. And If we are comfortable investing in altcoin why move in real estate. both also have the same potential loss so I think it depends on ourselves.

Naive and sentimental investors

Most of the people who invested in bitcoin are naive who just went along the Bitcoin hype, "everybody is investing in bitcoin, then why not me?". I can bet you that, most of them doent have a clue about the underlying technology. i.e BLOCKCHAIN. So the problem is that, reason why they invested is not because they are "amazed by the beauty of block chain technology" but simply because 'everybody is saying about bitcoin' 'celebrities saying good about bitcoin'. I hope you understood the problem, if everybody or even a celebrity started saying bad about bitcoin, they will run for their money crashing the price. Compared to that, altcoin users are more technically oriented ones. They know about blockchain, they know about the technology that particular coin is offering, and they are betting on that uderlying technology, not on some mass speculation.

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Bitcoin could be overpriced

Every tradable asset has two values, its intrinsic or true value, and the speculative value. Speculative value arise when people consider that asset as an investment fro future on the hope that, in future its price will increase. In the case of bitcoin we dont know the true value, but in most possible way it could be much less than todays price. Reson? Have you ever seen people using bitcoin anything other than for investment?As a currency for buying groceries? paying bills?.So if you bet your money on bitcoin now ,there is a high probability that, its price could drop to its true value, losing your hard earned money along the way. But if you consider altcoins, for most of them, price is much lower, possibly near or much less than the intrinsic value of the underlying technology.

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Invest long-term

Following the crypto currencies market trends and learning how to read and interpret the charts can be very rewarding. It's advisable to track investment in real time and avoiding rush decisions based on perhaps temporary momentary fluctuations. It's highly advisable to invest long term.

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Steps to invest in an ICO

Transfer your ETHER or BITCOIN to wallet from the exchange:

The reason for this is that when you use a centralized service such as a company like Coinbase/Unocoin/Poloniex, you do not own the private keys to your bitcoin or ether address. The way the ICOs typically work, you send them your ether or bitcoin, and the smart contract immediately sends the tokens back to your address. But since you don’t have private keys in Zebpay or Liqui or Coinbase account, if you send ether or bitcoin to an ICO address from your exchange account, you’ll simply be enriching the exchange instead of getting your desired tokens.

If you’re using ether, which is commonly accepted in ICOs, you can use a site like My Ether Wallet to create a new Ethereum key there and transfer your ethers on Coinbase to that wallet. Another option is Parity, which enables you to do things like invest in an ICO at an exact time — a feature that you might want to use if you believe the ICO will sell out within seconds. Once you’ve transferred your coins to a user-controlled wallet, you’ll have an ether or bitcoin address whose private key you control — and that means that you’ll be able to receive tokens there as well.

The token sale will post an address where money is being collected during a certain window of time. Be very careful that the address to which you are sending coins is actually the address of the token sale. Scams trying to get people to send their ether and bitcoin elsewhere abound. In fact, yesterday, during its ICO, Coindash.io’s website got hacked, and the crooks appear to have made off with $7.9 million worth of ether simply by changing the address on the website to their own.

You will receive the tokens based on your contribution.

After receiving the tokens, you can transfer it to Liqui.io or Binance or EtherDelta.io to sell those tokens if you feel like and get BTC/ETH in return.

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because some coins can really grow several times.why not take a chance to profit several times larger than your investment?I don't understand.

You have a chance to become rich if you invest in altcoins, but make no mistake it is not easy if it was easy then everyone will be rich in the forum and the last time that I saw a small survey about the amount of money that people had most people had less than 0.1 bitcoins, that should tell to you that most people in the forum have not become millionaires because of altcoins.