diff --git a/1_notes.py b/1_notes.py
index 770ae1b..0517885 100644
--- a/1_notes.py
+++ b/1_notes.py
@@ -1,36 +1,37 @@
-'''
-print(int('b',16), int('62ba1cd8a',16)) # Prints the hexadecimal representation of the value.
-/
-testnet : A small replica of bitcoin for developers to test their app without real money.
-We use bitcoin-cli command to communicate with a node. It is a command line utility.
-In this course we use >testnet rather than >bitcoin-cli.
-/
->testnet help
->mainnet help
-Prints all the commands to use in testnet or mainnet
-/
->testnet help getblockchaininfo
-Gets the help for the related command
-/
->testnet getblockchaininfo
-Makes the query with the method for the testnet. mainnet for the actual chain
-/
->mainnet getmininginfo
-Gives the mining info
-/
-Check how the nodes talk with each other from https://bitcoin.org/en/developer-reference#protocol-versions
-This changes from version to version. ipv4 / ipv6 / onion
-/
->testnet getwalletinfo
-Gives the wallet info
-/
->testnet listtransactions
-The transactions related to wallet
-/
-Code to connect to node
-If you don't have bitcoinrpc install it with pip:
-pip install python-bitcoinrpc
-/
+
+# Prints the hexadecimal representation of the value.
+print(int('b',16), int('62ba1cd8a',16))
+
+#testnet : A small replica of bitcoin for developers to test their app without real money.
+#We use bitcoin-cli command to communicate with a node. It is a command line utility.
+#In this course we use >testnet rather than >bitcoin-cli.
+#Prints all the commands to use in testnet or mainnet
+testnet help
+mainnet help
+
+#Gets the help for the related command
+testnet help getblockchaininfo
+
+#Makes the query with the method for the testnet. mainnet for the actual chain
+testnet getblockchaininfo
+
+#Gives the mining info
+mainnet getmininginfo
+
+#Check how the nodes talk with each other from https://bitcoin.org/en/developer-reference#protocol-versions
+#This changes from version to version. ipv4 / ipv6 / onion
+
+#Gives the wallet info
+testnet getwalletinfo
+
+#The transactions related to wallet
+testnet listtransactions
+
+#Code to connect to node
+#If you don't have bitcoinrpc install it with pip:
+#pip install python-bitcoinrpc
+
+"""
 Code:
 from bitcoinrpc.authproxy import AuthServiceProxy
 
@@ -51,10 +52,11 @@ mainnet = RPC(rpc_template %
         ('bitcoin', 'python', '68.183.110.103', 8332))
 testnet = RPC(rpc_template %
         ('bitcoin', 'python', 'localhost', 18332))
-/
+"""
+"""
 pprint : A package to print objects pretty.Especially JSON objects.
 from helpers import testnet
 from pprint import pprint
 
 pprint(testnet.getblockchaininfo())
-'''
\ No newline at end of file
+"""
\ No newline at end of file
diff --git a/4_hashing b/4_hashing.py
similarity index 100%
rename from 4_hashing
rename to 4_hashing.py
diff --git a/5_proof_of_work.py b/5_proof_of_work.py
new file mode 100644
index 0000000..ce4cf3f
--- /dev/null
+++ b/5_proof_of_work.py
@@ -0,0 +1,17 @@
+import hashlib
+
+#Try to find the hash (of a block) which starts with some amount of zeros. We are impersonating the miners acivities here.
+
+def hashed(d, n):
+    d += n.to_bytes(4, 'little')
+    return hashlib.sha256(d).hexdigest()
+
+data = b'hash of a block'
+nonce = 0
+zeros_required = 4
+
+while not (hashed(data, nonce)[:zeros_required] == ('0' * zeros_required)):
+    print (nonce, hashed(data, nonce))
+    nonce +=1
+
+print('Found:',nonce,hashed(data, nonce))
\ No newline at end of file
diff --git a/6_bitcoin_blockreward_calculator.py b/6_bitcoin_blockreward_calculator.py
new file mode 100644
index 0000000..7b7b904
--- /dev/null
+++ b/6_bitcoin_blockreward_calculator.py
@@ -0,0 +1,17 @@
+from helpers import mainnet, testnet
+from decimal import Decimal
+from pprint import pprint
+
+def calculate_bitcoin_cycle_and_block_reward():
+    #This little program gives the bitcoin's cycle count and the bitcoin block reward amount
+    INITIAL_SUBSIDY = 50
+    BLOCKS_PER_HALVENING = 210000
+    last_block = mainnet.getblockchaininfo()["blocks"]
+    cycle_count = int(last_block/BLOCKS_PER_HALVENING)
+    block_reward = INITIAL_SUBSIDY / (cycle_count*2)
+    return cycle_count+1, block_reward
+
+if __name__ == "__main__":
+    cycle, block_reward = calculate_bitcoin_cycle_and_block_reward()
+    pprint(cycle)
+    print(f"Bitcoin is in the {cycle}. halvening cycle and the block reward is {block_reward} ₿ right now.")
\ No newline at end of file
diff --git a/7_transactions.py b/7_transactions.py
new file mode 100644
index 0000000..3c28b5b
--- /dev/null
+++ b/7_transactions.py
@@ -0,0 +1,20 @@
+### TRANSACTIONS ###
+from helpers import mainnet, testnet
+from decimal import Decimal
+from pprint import pprint
+
+#We want to send bitcoin to an address
+#help(testnet.sendtoaddress()) bitcoin-cli sendtoaddress "1M72Sfpbz1BPpXFHz9m3CdqATR44Jvaydd" 0.1
+#First send tbtc to your address from a tbtc faucet then eun the program
+address = testnet.getnewaddress('','legacy')
+address2 = testnet.getnewaddress('','legacy')
+print(address)
+print(address2)
+print(testnet.getbalance())
+
+#We have sent the tbtc to an adress Bize output olarak bir tx döndürdü. We have sent tbtc to ourselves actually. It returned the transaction id
+tx = testnet.sendtoaddress(address2, 0.0000100)
+print(tx)
+
+#We can get tha transaction and check the input and the outputs
+pprint(testnet.gettransaction(tx))
\ No newline at end of file
diff --git a/bitcoin_blockreward_calculator.py b/bitcoin_blockreward_calculator.py
deleted file mode 100644
index 2d66e45..0000000
--- a/bitcoin_blockreward_calculator.py
+++ /dev/null
@@ -1,15 +0,0 @@
-from helpers import mainnet
-from decimal import Decimal
-
-def calculate_bitcoin_cycle_and_block_reward():
-    #This little program gives the bitcoin's cycle count and the bitcoin block reward amount
-    INITIAL_SUBSIDY = Decimal(50)
-    BLOCKS_PER_HALVENING = 210000
-    last_block = mainnet.getblockchaininfo()["blocks"]
-    cycle_count = int(last_block/BLOCKS_PER_HALVENING)
-    block_reward = INITIAL_SUBSIDY / cycle_count*2
-    return {"Cycle":cycle_count+1, "Block_reward":block_reward}
-
-if __name__ == "__main__":
-    cycle = calculate_bitcoin_cycle_and_block_reward()
-    print(f"Bitcoin is in the {cycle.get('Cycle')}. halvening cycle and the block reward is {cycle.get('Block_reward')} ₿ right now.")
\ No newline at end of file