Also cryptopia, livecoin and novaexchange list new cryptocurrencies. A few weeks ago, I would have said, that poloniex would be the best exchanger for well known cryptocurrencies but at the moment there seem to be some difficulties at support and wirhdraws. I didn't have any problems but this forum is full of posts about problems with polo these days.
Also Bittfinex is a good exchanger, where you also can lend your coins.

Yobit investbox pays out interests correctly. But it is although important to take care of coins that are listed there. If interests are unrealistic high, then only for the reason that they are sold. When you do a little research on the market, then you see that some new cryptos (of course not all) are on the market with a price of one satoshi and with low movements. So i guess, they are only baught by investors, who want to get the high interests.

I have sent today and these days a few transactions and yes, the fees decreased and Bitcoin transaction was very fast. But a few times the fees suddenly went dramaticly up, so that I desided to wait a few minutes. After a short while the fees indeed went down. I could also adjust the fees to a price, I want, but feared, that Bitcoin gets awful delay.

Solange man die privaten Schlüssel hat, ist man ja von Herstellern und Betriebssystemen unabhängig. Brauchst nicht mal Hardware oder Papier.

Ich hatte auf coinomi bch gegen doge getauscht. Das hat auch ungewöhnlich lange gedauert. Zwar nur einige Stunden, aber sehr lange im Verhältnis zu sonst. Übrigens tausche ich dort nicht mehr, wollte nur das BitCash loswerden. Die Gebühren sind ja wirklich saftig.

I used coinbase a long time, because it ran proper, transactions worked very fast and coinbase didn't demand transactions fees, so they paid the fees. Now I use wallets, that support im- and exporting private keys and that allow own adjusting of transfer fees.

But before you make a paper wallet, transfer first your bitcoin to another wallet, if you have them on the same adress, just asure, that you will not loose them.

If this site would shut down, you can use any ethereum or multiwallet that supports also tokens (if needed) and that makes it possible to import private keys like exodus or coinomi for example.

That sounds different to the news about bitcoin.de
So give they out all user data or only the investigated adress?

I also know, that sports gambling can be manipulated, but not easy by a single gambling service. It is neccessary to manipulate the sports game itself. All what a single gambling site could else do is, besides corrumping sports people and arbitrators, what is nowadays not easy, giving out their own odds.

Sports bets are less risky than casino games for three main reasons:
1. Results can not be manipulated by gambling services.
2. Knowledge and informations can significantly success.
3. You cannot bet as fast as in casino games.

The highest loan ratings, I got on poloniex, were 4 percent with doge on its hype.
I will wait a bit and go to lending.

That's the problem. In many regions electricity cost are to high for making profits on mining with own hardware.
So that's the reason for several users to try out cloud miners. And the most "cloud miners" are scam. Two or three seem to be legit but profits will earliest show in 17 months, if bitcoin and other cryptos, that are mines will go up or down and mining difficulty increases.

What about this example?
I had BTC and BCH on coinomi wallet. Dumped BCH and exchanged them to another coin. Then deactivated the BCH wallet in coinomi.
Is there also a possibility to loose the bitcoins? For example when I export private key.

Zunächst einmal bedanke ich mich ganz herzlich für deinen wunderbaren Bitcoinkurs. Dieser bringt schwere Materie einfach und anschaulich rüber. Auch der Aufbau in einzelne Lektionen gefällt mir sehr gut. Ich habe bisher nichts an deinem Kurs auszusetzen. Wenn ich ihn ganz durchgearbeitet habe, gebe ich nochmal ein Feedback. Aber eines schon vorweg: Seit Jahren habe ich so einen Kurs gesucht und nun gefunden.
Update: Zu der Generierung einer Paperwallet durch Bitadress: kann ich diese auch wieder abrufen, wenn der Service nicht mehr existiert? Kann ich damit  auch eine Brainwallet erstellen?

I also was not aware of the August 23th. Only August 1st, 8th and november with second hardfork with a second free coin maybe.
We should make a time plan for good predictions.

Yobit informs about the conditions on adding new coins here:
https://yobit.net/en/addcoin/
and here:
https://yobit.net/en/yobicodes/
there you can also see the minimum balance requirements.
I wish you great success for your project 

1. On Bitcoincash.org are listed many wallets, that support the free BCH from split.
2. You should not transfer your BTC, but in opposite your privat key or seed from the wallet, you had your BTC before split on August 1st. It is really important, that you transfer your BTC into another place, before you export your private key.
So to maybe explain more clearly:
You have your wallet where you have your BTC and you already had them before hardfork August 1st. You empty your wallet by transfering your BTC no another wallet of your trust.
Then you look for a wallet, that supports BCH and export your private key from your now empty wallet. The history of your wallet is saved. It doesn't matter that it is now empty. Now you can gain free BCH without the risk of loosing your BTC.

I dumped BCH only for one reason. Didn't want to have them in one wallet with my Bitcoin. There seems to be a risk to have BCH at same adress as Bitcoin.

Yes, trading seems also to me like gambling
Cloud mining: I know three companies, that are for years on the market: Eobot, Hashflare and Genesis. Others I saw, were all scam.
I have experience on eobot and hashflare. Didn't try out genesis.
Cloud mining will not bring 5-10 percent for sure in the month.
You pay for example 10$ in and have to wait around 17 to 24 months to get your 10$ back. Also if you have your own hardware, you will only earn on longterm. Cloud mining is risky, because a company could shut down before you are in profit or even got your investment back.
I only can compare hashflare and eobot. On hashflare you can for example buy a lifetime contract with one payment. But you are fixed on this contract an cannot cash out this contract, just hope, that the company will stay online at least you got your investment back or make even profit and roi lays at around 20 months or more.
On eobot you can buy a 5 years contract and "mine" several cryptocurrencies.Your risk on eobot is not so high as on other cloudminers because you can exchange your 5 yrs contract at any time to a 24h contract and make fast payout. You can also decide, what you want to mine. But also there us the roi at around 17 months. Its although interesting for newbies because they see prices of several currencies in realtime and get a good eye for movements. Also there is no need to invest. I often just watch the prices of those currenciey wich are placed on one site.
Lending can give you a very good chance to reach your goal of 5 to 10 percent a month. One of the first lending places was poloniex. There you could choose a currency for example bitcoin, litecoin doge and so on and you could choose your lendiing interest rate and lending time. There where lending offers and bids. Sometimes users could earn with interests up to 4 percent a day. But around 0 1 percent would be more realistic. Unfortunately poloniex seems to have problems so you could try on bitfinex.
A good way to invest could be also ICOs. You invest into a project like new technology, gaming platforms, solarparks, healthcare and more. You get new cryptocurrencies in presale. When the project succeeds, the new altcoin could get up multiple times. But you should do good researches to invest into new projects. Here at bitcointalk you can find many good ressources.