diff --git a/STEP1_Basics/1_Hello_world/main.py b/STEP1_Basics/1_Hello_world/main.py
new file mode 100644
index 0000000..44159b3
--- /dev/null
+++ b/STEP1_Basics/1_Hello_world/main.py
@@ -0,0 +1 @@
+print("Hello world")
diff --git a/STEP1_Basics/2_Arithmetic/main.py b/STEP1_Basics/2_Arithmetic/main.py
new file mode 100644
index 0000000..c68cab0
--- /dev/null
+++ b/STEP1_Basics/2_Arithmetic/main.py
@@ -0,0 +1,21 @@
+x = int(input('Enter x: '))
+y = int(input('Enter y: '))
+
+sum = x + y
+sub = x - y
+mult = x * y
+div = x / y
+pow = x**y
+sqrt = x ** (1/y)
+
+print(f'''
+Results:
+-----------------------
+sum: \t {sum}
+sub: \t {sub}
+mult: \t {mult}
+div: \t {div}
+pow: \t {pow}
+sqrt: \t {sqrt}
+-----------------------
+''')
diff --git a/STEP1_Basics/3_Formatting/main.py b/STEP1_Basics/3_Formatting/main.py
new file mode 100644
index 0000000..2e48d64
--- /dev/null
+++ b/STEP1_Basics/3_Formatting/main.py
@@ -0,0 +1,12 @@
+day = int(input('Enter day of the month: '))
+month = input('Enter name of the month: ')
+year = int(input('Enter the year: '))
+
+yyyy_mm_dd = f'{year}-{month}-{day}'
+dd_mm_yyyy = f'{day}-{month}-{year}'
+
+print(f'''
+Result:
+yyyy_mm_dd: \t {yyyy_mm_dd}
+dd_mm_yyyy: \t {dd_mm_yyyy}
+''')
diff --git a/STEP1_Basics/4_Double_array/main.py b/STEP1_Basics/4_Double_array/main.py
new file mode 100644
index 0000000..ae91ef3
--- /dev/null
+++ b/STEP1_Basics/4_Double_array/main.py
@@ -0,0 +1,28 @@
+matrix = []
+for i in range(10):
+	matrix.append([0,0,0,0,0,0,0,0,0,0])
+	#matrix.append([])
+
+# Fill from left-top to right-top
+for i in range(10):
+	matrix[0][i] = i
+# Fill from left-top to left-bottom
+for i in range(10):
+	matrix[i][0] = i
+
+# Fill crosshairs
+for x in range(1, 10):
+	for y in range(1, 10):
+		# Values from left side and top side
+		l_val = matrix[x][0]
+		t_val = matrix[0][y]
+		# Set value on zero-place
+		matrix[x][y] = l_val * t_val
+
+for line in matrix:
+	for el in line:
+		if el >= 10:
+			print(f'{el} ', end='')
+		else:
+			print(f'{el}  ', end='')
+	print()
diff --git a/STEP1_Basics/5_Recursion/main.py b/STEP1_Basics/5_Recursion/main.py
new file mode 100644
index 0000000..b3d0680
--- /dev/null
+++ b/STEP1_Basics/5_Recursion/main.py
@@ -0,0 +1,27 @@
+from random import randint
+
+nums = []
+for i in range(10):
+	nums.append(randint(1, 100))
+
+def rmin(nums, l_len = len(nums), i = None):
+	# If we at the end
+	if i == l_len - 1:
+		return nums[i]
+	# If main fun (we just started)
+	if i == None:
+		i = 0
+	# Compare next i and current i
+	n_i = rmin(nums, l_len, i+1)
+	if n_i < nums[i]:
+		return n_i
+	else:
+		return nums[i]
+
+min = rmin(nums)
+
+print(f'''Original list:
+{nums}
+
+Min: {min}
+''')
diff --git a/STEP1_Basics/6_Files/file b/STEP1_Basics/6_Files/file
new file mode 100644
index 0000000..c24e1f9
--- /dev/null
+++ b/STEP1_Basics/6_Files/file
@@ -0,0 +1,2 @@
+1 2
+2 3
diff --git a/STEP1_Basics/6_Files/main.py b/STEP1_Basics/6_Files/main.py
new file mode 100644
index 0000000..5188633
--- /dev/null
+++ b/STEP1_Basics/6_Files/main.py
@@ -0,0 +1,38 @@
+a = int(input('Enter a: '))
+b = int(input('Enter b: '))
+
+matrix = [
+	[a, a+1],
+	[b, b+1]
+]
+
+first = True
+for line in matrix:
+	#for el in line:
+	if first == True:
+		f_str = f'{line[0]} {line[1]}\n'
+		first = False
+	else:
+		s_str = f'{line[0]} {line[1]}\n'
+# Write lines
+with open('file', 'w') as f:
+	f.write(f_str)
+	f.write(s_str)
+	f.close()
+
+readed_matrix = []
+with open('file', 'r') as f:
+	for x in f:
+		if x == '' or x == '\n':
+			continue
+		x = x.replace('\n', '')
+		vals = x.split(' ')
+		readed_matrix.append(vals)
+	f.close()
+
+print(f'''
+Original matrix:
+{matrix}
+Readed matrix:
+{matrix}
+''')
diff --git a/STEP1_Basics/7_JSON/data.json b/STEP1_Basics/7_JSON/data.json
new file mode 100644
index 0000000..0e7cbf9
--- /dev/null
+++ b/STEP1_Basics/7_JSON/data.json
@@ -0,0 +1,29 @@
+[
+  {
+    "name": "Иван Иванов",
+    "age": 21,
+    "grades": {
+      "math": 85,
+      "physics": 90,
+      "history": 78
+    }
+  },
+  {
+    "name": "Мария Петрова",
+    "age": 22,
+    "grades": {
+      "math": 92,
+      "physics": 88,
+      "history": 80
+    }
+  },
+  {
+    "name": "Алексей Смирнов",
+    "age": 23,
+    "grades": {
+      "math": 75,
+      "physics": 84,
+      "history": 79
+    }
+  }
+]
diff --git a/STEP1_Basics/7_JSON/main.py b/STEP1_Basics/7_JSON/main.py
new file mode 100644
index 0000000..cdb50a7
--- /dev/null
+++ b/STEP1_Basics/7_JSON/main.py
@@ -0,0 +1,31 @@
+from json import loads
+
+with open('data.json', 'r') as f:
+	raw_data = f.read()
+	f.close()
+data = loads(raw_data)
+
+# Data for further analyze
+stud_i = []
+stud_score = []
+
+stud_80_plus = []
+for i in range(len(data)):
+	stud_i.append(i)
+	average_score = (data[i]['grades']['math'] + data[i]['grades']['physics'] + data[i]['grades']['history'])/3
+	stud_score.append(average_score)
+	if data[i]['grades']['math'] > 80:
+		stud_80_plus.append(i)
+
+average_best = max(stud_score)
+aver_i = stud_score.index(average_best)
+aver = data[aver_i]
+
+print(f'''Student with best average score:
+{aver['name']} {aver['age']} {aver['grades']['math']}-{aver['grades']['physics']}-{aver['grades']['history']}
+''')
+
+print('Students with 80+ math scores:')
+for i in stud_80_plus:
+	stud = data[i]
+	print(f'''{stud['name']} {stud['age']} {stud['grades']['math']}-{stud['grades']['physics']}-{stud['grades']['history']}''')
diff --git a/STEP1_Basics/8_Threads/main.py b/STEP1_Basics/8_Threads/main.py
new file mode 100644
index 0000000..d55f3c4
--- /dev/null
+++ b/STEP1_Basics/8_Threads/main.py
@@ -0,0 +1,44 @@
+from threading import Thread
+from queue import Queue
+from time import sleep
+
+sum = 0
+access = 0 # Var for control who is allowed access for sum, start with 0 Thread
+threads = 3
+th_pool = []
+is_live = [0] * threads
+
+def worker(i):
+	global sum, access, threads, th_pool, is_live
+	th_pool.append(i)
+	is_live[i] = 1
+	# Wait until all threads is registred
+	while len(th_pool) != threads:
+		sleep(0.1)
+	for _ in range(3):
+		#sleep(threads)
+		while access != i:
+			sleep(0.1)
+		sum += 1
+		print(f'T{i} | {sum}')
+		sleep(0.1)
+		# Transfer access
+		if len(th_pool) > 1:
+			ind = th_pool.index(i)
+			next = ind + 1
+			if next > threads - 1:
+				next = 0
+			access = next
+		else:
+			access = i
+	is_live[i] = 0
+
+for i in range(threads):
+	th = Thread(target = worker, args = (i,))
+	th.start()
+
+# Wait untill all ended
+while is_live != [0] * threads:
+	sleep(0.1)
+
+print(f'\nSUM: {sum}')
diff --git a/STEP1_Basics/9_Network/client.py b/STEP1_Basics/9_Network/client.py
new file mode 100644
index 0000000..2136f76
--- /dev/null
+++ b/STEP1_Basics/9_Network/client.py
@@ -0,0 +1,19 @@
+import socket             
+ 
+# Create a socket object 
+s = socket.socket()
+port = 12345
+s.connect(('127.0.0.1', port))
+
+data = '''{
+    "name": "Иван Иванов",
+    "age": 25,
+    "city": "Москва"
+}'''
+
+# Send data
+s.send(data.encode())
+# Receive data
+print(f'STATUS: {s.recv(1024).decode()}')
+
+s.close()     
diff --git a/STEP1_Basics/9_Network/server.py b/STEP1_Basics/9_Network/server.py
new file mode 100644
index 0000000..986313a
--- /dev/null
+++ b/STEP1_Basics/9_Network/server.py
@@ -0,0 +1,28 @@
+import socket
+from json import loads       
+ 
+# Create a socket object
+s = socket.socket()
+port = 12345
+s.bind(('127.0.0.1', port))
+print ("socket binded to %s" %(port))
+ 
+# Put the socket into listening mode 
+s.listen(5)    
+ 
+while True: 
+	# Establish connection with client. 
+	c, addr = s.accept()     
+	print ('Got connection from', addr )
+
+	raw_data = c.recv(1024).decode()
+	data = loads(raw_data)
+	print("\nParsed data:")
+	for i in data:
+		print(f'{i} - {data[i]}')
+	print()
+
+	c.send('OK'.encode()) 
+ 
+	# Close the connection with the client 
+	c.close()