The best strategy I personally like is to buy altcoins (only the best ones) and hold for long run.
I think this is the most safest option in investment.
In Nov 2016 I invested in a altcoin and the price increased of that coin by +68,000%
I was a fool, that's why I didn't sold at that point. I thought that the price will increase a little more.
But later the price dropped unexpectedly. So you have to be more thoughtful to exit with nice profit.
I wonder what coin is that. To be honest, I don't really expect that much from altcoins so I usually just do 20% gain and then that's it. Even if it skyrockets, it will be fine with me because I know for myself that I wasn't ready to wait that long and I'm only aiming for a little gain instead of experiencing loss because of holding for extra long time. You basically held the coin for a very long time and so you ended up being a bagholder of that coin. Some people are actually just investing in shitcoins and then hope that one of them would skyrocket. It is proven profitable by others but just how lucky are you to invest in one of those coins. It doesn't really require that much money since they are shitcoins. On the other hand, most of the coins will remain a shit coin forever.
One advise, having your money doubled in an altcoin investment is already good enough and so sell your coins right away. Do not be greedy. Trading is just like gambling, the more greedy you are, the more risk that you are taking, and the more chances of you losing in the long run. Another advise is to put some of your altcoins in the exchanger site but not all of them. This is just so that you can take action right away if there comes a pump. Sometimes the transaction time is too much that once you have received the coin in the exchange, it's already too late and the pump is already over.
It was one of the good coin (InsaneCoin - INSN) where I had invested. My prediction was almost correct for that coin.
When I bought that coin I had a thought that price will hit 15k satoshis one day. So I have to hodl as long as I can.
My average buying price was 19 satoshis and the highest price of that coin ever reached was 13898 satoshis in cryptopia and it took only 8 months.
You can see now that my prediction was only behind by 1102 satoshis. My sale order was at 15k satoshis.
But I still believe the price will rise again when alt markets gets stabilize.
And most importantly some updates yet to come for that coin. I am hoping the updates will be announced soon. After the updates, price will rise again.
Wish me good luck!