Eth is the competitor of bitcoin, this is for sure. With the unique feature like smart contract of Eth that allow reversable trading, it makes better life for investor but the acknowledgement by public for bitcoin is much more better and more popular than Eth. Thus their relationship is competitor.

1. Know the people behind them
2. Go for disruptive concepts
3. Understand the target market
4. Evaluate the technology
5. Nitpick the white paper
6. Know what the coins are for

All these features are included in Ambit Mining https://ambitmining.io/

Chances are that the market will continue to chop for a couple of months and stabilize. The wave in November and December was unnatural and the recent crash was the reaction to the over bought market. It will find stability and then steadily increase again. May happen this year, maybe next year, but crypto will get back to its previous all time highs.

The best wallet for using altcoins is myether wallet. It is easy to use and safe to store altcoin. You can hold altcoins for a long time in this wallet.

Check white paper firstly to identify a clear disparity, because all info about ICO can be a fake. WP gives the more information what is the project relenvancy and future growth of the project. Mostly don't join high cap ICO because too many coins value will dumps once the coin launched. Check team members in google.

Better research first and compare the altcoins side by side. Read feed backs from other investors. If you put all of that in one altcoin, then you will become rich if the altcoin will succeed few years from now. But all of that are risky. Might as well split the half to other promising altcoins.

Currently, the bitcoin price is beginning to weaken, and this will affect all types of altcoin. but I'm sure this is only temporary, because bitcoin prices never have a stable price, if you withhold and be patient, I'm sure in the near future, you can make a profit.

It is necessary to be prepared when participating in campaigns that within a month or two of the results will not be visible, the main thing is not to despair

Yes, altcoin has a future but not all of them, just some altcoin from successful projects and from a solid team that will be like BTC. Succesfully altcoins are altcoins that has uniq project and will be solved many problems. I think some altcoin that will be like BTC  and have a future is like: ETH, DASH, LTC, XMR.

Out of your listed coins, few of them does not have its ICO launch date-end date so when, so those are pending for review??

It depends on your investing strategy. You can keep tokens on exchange if you are going to speculate.
In case of long-term investment it's better to hold coins in wallets. The best - "cold" wallets and Ledger.