Thank you @yousafharoonkhan for this week lecture, as it is very important in the cryptocurrency ecosystem. I am @promo-nigeria and am delighted to be part of your class this week.

Introduction
Exchanges are very crucial part of cryptocurrency as they act as the middleman between the investor and the Crypto currency owners. Many others also use it in storing cryptocurrency, though not very safe. They can further be divided into Centralized and Decentralized Exchanges.
Following your questions strictly.....

[Pixabay Edited]

Task 1

Question no 1 : Write the definition of Decentralized and Centralized Exchange in your own words.(definition should cover exchanges ,not system) only explain in your own words, after understand the exchanges.

In a simple definition Centralized exchanges are those that requires a middleman for its operation. What that means is that when you want to buy cryptocurrency, an order is placed and these exchanges interact with the cryptocurrency owners on your behalf using an order book, these exchanges are managed by a company and not the cryptocurrency owners.
Decentralized exchanges is likely the opposite as no middleman is required in this. What this means is that when you are buying cryptocurrency, the interaction is between you the buyer and the cryptocurrency owner. This is quite easier and safer.

Task 2

Explain in your own words the difference between decentralization and centralization exchanges.

There are clear differences between Centralized and Decentralized Exchanges, one profound difference is that there is no middleman controlling the trade, the interaction as stated is between you and the cryptocurrency owner. To ensure a safe trading and to keep your asset secured, centralized exchanges requires you set up your KYC features before being able to trade, whereas decentralized exchanges does not need such.

Decentralized exchanges put you in total control of your crypto asset, you have the sole responsibility of protecting your wallet, your private keys, etc whereas centralized exchanges are in total control of your keys and your assets. In real sense, decentralized exchange gives you 100% privacy.

In terms of security, decentralized exchange are considered to be safe than centralized exchanges, decentralized exchanges are less prone to hackers but centralized exchanges can be hacked.

When we consider fees, centralized exchanges requires higher fees when compared with decentralized exchanges, though we have a high volume of trade on the centralized exchanges.

Task 3

Question no 3 : write about any 2 best centralised exchanges of 2021 . why are they best in front of you?

There are so many centralized cryptocurrency exchanges, I trade on almost about 5 exchanges but my most preferred are Binance and Poloniex.

Binance is currently no 1 cryptocurrency exchanges, I like binance because it is safe and very fast. It has a very user-friendly interface making it possible for Anyone at to trade. Binance has one of the cheapest trading fees. Moreover, they have have never been attacked by hackers. They also have lots of alternatives coins you can choose and invest in.
Here is my account on Binance centralized exchanges

Another centralized exchange is Poloniex, though had an attack some years ago, they have been able to tighten up their belt and exchange is now secured. I use poloniex to hold my Tron token realised from my post @steemit. It also has user friendly interface.

Also attached is my Poloniex centralized exchanges wallet

Task 4

Question no 4 : Install Metamask, and share step by step screenshot ,(Practices step by step )

In installing my Metamask, I would prefer to use my a mobile app

First I visit Google play store, I find the app, then download it

Next is wallet setting up

image source

Next is wallet back up which is a very important
stage in wallet creation, if you need to import wallets or recover wallets provisions are made
Once wallet is set up, wallet is set to use

image source

Next stage is securing your wallet by writing out you seed phrases

image source

Wallet is ready for use

Task 5

Question no 5 : How to use Uniswap exchange , and Swap/buy or swap/sell any coin (practicle step by step )

Uniswap exchange is used to swap from one ERC-20 coin to another and vice versa. Just like any other swap interface, it requires you have token available in you wallet to complete the swap.

First locate Uniswap on the Decentralized exchanges section of Meta mask

Select a token to exchange

And connect your wallet

Conclusion
Centralized exchanges have been the most used in the cryptocurrency ecosystem, but the emergence of the decentralized exchanges is giving the ecosystem a new trajectory.

Thank you sir.