There are so many books on the website about blockchain but only you can learn about this once you have started using it. Blockchain is a technology that distributes computing and cryptography. If you want to learn this technology then read the BTC whitepaper and you will get to know why it is different from normal algorithms. so that you will get some fundamental knowledge and find out the way how to implement it in the real scenario. Make sure you are comfortable with basic cryptography algorithms and internet protocol.

The private key is the bit of a code which is paired with a public key. Basically it is the key that is used for both encryption and decryption. The public key is held publicaly so there is no possibility of a loss of the keys but in private key, the key may be lost which is used by a particular individual.

Bitcoin is the most popular coin in the crypto industry. So it is important to keep your coins securely so that you don't lose it. Moreover, you have to be extra careful if you are keeping your wallet on your android device.

Still, you can refer to some wallets for your android device.

• Ledger nano x- (It is not a mobile wallet but someone can access through mobile app and it is the most secure wallet but the only drawback is you have to carry the required device and it is a malware proof device so there is no risk that the private keys to get exposed to the internet)
• Coinomi- (It is a popular wallet that supports multiple cryptocurrencies which allows simple backup and private keys the only drawback is it is not open source).
• Mycelium:(It is the most popular wallet for android and it supports offline hardware wallet also)

So choose the BTC wallet which has an easy user interface and feasible for your device.

Don't download thousands of app in your mobile. Download the exchange app which is more reliable and profitable for you.Enable your 2FA to verify your identity while doing the transactions.
Before install any app try to read reviews on forum and on the official websites of the exchange so that you can understand the pros and cons. So choose the best app which is convinient for you.

 Nowadays hackers are very smart and they always find a way to steal from people.alaways double-check the address where you are supposed to send your coins.
If some malware program installed once without your knowldge your funds will send to the hacker's address instead of the particular exchange address.
If the coins are confirmed by the blockchain it can't be reversible.
So it is good to check what type of program is accessible on your device by your administrator.
Try to up to date one good virus scanner for your system.

Be aware of the token price if the price is too low. Always check the platform if the price is too low on them. Then check the official page of the tokens. If you are doing small transaction then always try to see that you are getting the right tokens.
Be sure to use one reputed exchange for buying and selling your coins.
Don't participate in any giveaway where someone will ask to send some small amount then you will get your reward.

In every article, it has written some different pairs which are good but it is absolutely your turn to pick the good pairs for you from which at least you can get some good profits in the future. So choose wisely.

As there are somany resons involved in this but still you can follow some rules-Always keep in mind that the wallet you choose that should be supporting your device. You can store eth in ledger nano s (It supports other cryptocurrencies as well) or trezor wallet(Which is the most secure offline wallet).
Do double check while sending your funds.you can check the addresses here- etherscan, ethplorer, etherchain
Don't believe on who says you will get free eth maybe it is related to some hack.(Especially don't believe on social media messages)

Frankly speaking always have the wallet which will work across window,android, chrome or ios may be it might be tricky for first time user. If you want you can use web wallets which is controlled by third party but you can get some good platforms in the market for this so choose according to your preference.You can keep the majority of your coins in hardware wallet and some smaller amounts you can keep it in web wallet.

Thank you for your recommendation.Next time when I will check my transaction will definately use https://blockchair.com/ and see how it will work.

You will check the btc transaction by using- https://www.blockchain.com/explorer.
First go to the search bar and then use the search bar on the upper right side where put your btc address, transaction hash of the btc sent by you, also you can enter the block number and then search.
Once you enter enter all the information your transaction will display.

There are dozens of exchanges now a days but choose the one which gives you the best market rate with hassle-free experience.
In trading always try to put the small amount of your portfolio.
Take your investment decisions very carefully means double check the exchange where you are going to invest your money.
Always be assured about the fees of the particular transaction and the timeframe of the order completion.

Electrum wallet is a very trusted software wallet.Its platform is very easy to hold coins securely.For this the wallet sign up is very easy and convinient to use. Its payment method is very easy which verify your transactions in some seconds also you don't have to download the whole blockchain.
Electrum wallet you can use on windows, mac os and linux operating system.You ca store your private key offline in a hardware wallet used in coexistence with electrum.

Blockchain can n't be explain in some lines it is very huge to undersatnd. You can refer some books from amazon at lowest cost to get more knowldge.
1. Beginning blockchain
2.Blockchain for beginners
3. Mastering blockchain

It is good to own the right wallet which can keep your btc secure. To create a bitcoin wallet first you have to choose the wallets like hardware wallet, paper wallet, online wallet and desktop wallet. So it is always good to store your coin in hardware wallets like ledger nano which is secure and through this you can run multiple apps.Also there is no risk of private keys exposed.

Now days if you are trading in crypto industry so that you can make money from that.Here are few tips I will share-

• Always try to do your own research if you are investing on any coin and don't believe on all social media news because it is not true everytime.
• Try to trade with some good strategies.
• Hold and buy the coins when its value is low so that you can get more profit in future when the market is increase.
• Also you can search about all coins volume, supply and  price of the coins in every seconds on coinmarketcap.com so that it would be useful for everyone to invest.
• Try to read the whitepaper of the coin so that you can decide wheather that coin is worth investing or not.

Please make a digital copy of your seed as it may decreses the security of your hardware wallet.
Keep your seed in safe with limited access.
Don't type your seed phrase on any website keep it safe.
If it is possible then try to keep your seed phrase with a password you can also enable two factor for this.

Here are the two threads which I have created:
1. https://bitcointalk.org/index.php?topic=5179552.msg52290743#msg52290743
2. https://bitcointalk.org/index.php?topic=5178947.msg52270904#msg52270904

Here are some of other threads on which I have replied-
1.https://bitcointalk.org/index.php?topic=5169385.msg51967378#msg51967378
2. https://bitcointalk.org/index.php?topic=5167812.msg51915402#msg51915402

Thank you for this oppertunity @2double0

It is always adviceable that don't store your coins on the exchange but there are some mobile wallets are there who controls your private keys just like free wallet.If you keep your funds with them they can do what ever they want to do with your funds.So it is better to use that you can control your private keys.Also it is better to use one trustable wallet.