Yes, you're right brother,that trading bitcoin is suitable for long term and trading in altcoin is for short term trade.
How do you feel about mining in bitcoin, whether mining is currently the best way to get the bitcoin?

  yes buying and selling bitcoins is now profitable to earn bitcoins but trading bitcoins is much more safe than other investment I don't think so.
 trading also requires some skills that could help to gain a constant profit .
trading isn't just buying low and then selling in high value .
trading without simple basic knowledge about is no less than gambling 
yes skills can be developed later after some practice but without them trading is as good as gambling
eventually trading has minimum risk only gotten who actually know how to trade  and who know the difference between trading and gambing

Everything is earning, I don't know what OP have against signature campaigns. We are making promotion for sites, we wear their signatures and for that we are paid. Not everyone here have skill needed for earning bitcoins, but like you said with just knowing English we can earn some bitcoins and try to make more with that what we have, like I do with gambling for example.

That way is need really big capital or time to learn skill that required. Investing money (bitcoin) in ICO could be great way to make your bitcoin grow because the price of the coin could be highly rise when it's get into popular exchange site.

By joining sig campaign you can earn btc because you will be paid by the advertiser. After all, it is important to post constructive things which add to the conversation, and not easy as you think. Investing but if you are don't have the skills, knowledge and time you might end up losing your money.

Never make that as your main job, otherwise this campaign will be full of spammers who just want to earn a small amount of money posting non sense. Think that is just a reward for your loyalty and being active on the forum but always consider to learn the most popular which is trading IMO.

building your own shops where you will accept bitcoin, but i think it will more worth in such place where the users of bitcoin are more, for joining an ico you need a lot of knowledge about  the coin, whose ICO you are going to join. to me personally invest my bitcoin in such altcoins which are already launched in exchanges.

until now, I think it is the best way that has a high enough risk. despite having a high enough risk, but, altcoin trading may have the lowest risk of another quick way. Well, I have tried a variety of ways, but this is a very quick way that is good enough to make bitcoin.

I think mining is no longer a recommended method, especially cloudmining, in addition to the longer time to ROI. the future of mining is also not so good, so it would be better if you use a method that has long useful life

IMO earning fiat and buying Bitcoin with it is the best way, many methods suggest here are too risky (gambling, trading, some forms of investing), other methods, like signature campaigns or faucets will yield very small amounts. Working for Bitcoin can be good, but it's really rare so you can't rely on it. So building your career in fiat world and using your earning to buy BTC is the best way.