Today Cryptocurreny market growing really fast with market cap over $600 Billion and there is hot issue between BTC and BCH as standard valuable of cryptocurrency next year, as we see right now both coin prices spikes really unpredictable. DeepOnion can be solution for big drama between BTC and BCH with all the features they offer:
1.   Anonymous, this can pass government regulation and hard to control by government, just like first idea why cryptocurrency has been made.
2.   POW and POS minting, energy efficient and effective for long term.
3.   Low fee transactions, comprehensive for all purpose transactions such as trading, investment, e-commerce business, etc.
4.   Instant confirmation, in fast growing market every second is count, don’t lose your profit just because waiting block confirmation for hours.

I never know if ethereum can be mined with browser, how many hasrate you get? Can you share it to me? Since I only got $3 for mining ETH in 1 day with my rig and I just stop it since it's not profitable.

What Zcash offer already available on previous coin like DASH. But this coin have been the most expensive coin ever in cryptoworld when the first day launch (hit 6BTC for 1 Zcash) due to hype and then prices getting correction and drop dramatically in few days. I got some from mining it and selling in good prices.

Actualy is the same coin but hardfork due to security problem which old ETH(ETC) has been hacked and 2million coin already stolen. So investor make consortium to hardfork and restore system with previous amount of ETH before hacked. So right now 2million coin ETC still holding by hacker they can sell it anytime, that's why people didn't have big interest to invest on it. Only used as speculation coin right now. As you can see on coinmarket price factor gap between ETH and ETC so far by 20 times right now rather than last year.

I bought it when the prices still $5 1y 3 month ago. And I sold all of them when the prices hit $50, and right now I feel so bad about it. Never cross in my mind dash will hit $800, But I still have dash contract mining on genesis and got some each month .

I have my judgement for airdrop, first take a look how many airdrop (if too low I better skip it) and if you need to install a wallet, you can virus scan it first on web and this the important thing Install it on your virtual machine, you can backup it later after ICO and development ongoing as seen on roadmap since most of them just abandon project after ICO. About sending ETH to contract address it's normal since ERC20 token need gas (if you ethereum user you know what is gas for) and It can so costly if you have to sent bulk token for many address that's why they need small fee ETH to cover it.

Ok so this for ICO that might have financial securities problems right? I think lending coin ICO must be considered as financial securities ICO, I have create a thread about lending coin list, but I have some in ICO progress right now. Here some of them:
ICO:GoldGate, on first week presale their email template using another ICO link , you can search it on youtube many people already review it.
ICO:Eigencoin, first day of ICO some member lost their BTC deposit due to unstable system, you can get it from bitcointalk forum if OP didn't delete the thread yet.

It's very easy to encashing BTC, you can use reputable exchanger like coinbase or use localbitcoin ( you can get list of local bitcoin in your country from here https://bitcoin.org)