• you can iterate on characters in a string :

s = "hello"
for c in s:
	print(c)
	

# output
# h
# e
# l
# l
# o

• To make a character to lowercase and uppercase:

c.lower()
c.upper()

• Check weather a character is a alphanumeric or not: (alphanumeric means a-z, A-Z or 0-9)

c.isalnum()

• Adding two strings:

added = 'h' + 'e' + 'l' + 'l' + 'o'

print(added)

# output
# hello

• Reverse a string

# Method 1: Using string slicing
s = "hello"
reversed_s = s[::-1]
print(reversed_s)  # Output: olleh

# Method 2: Using reversed() function and join()
s = "hello"
reversed_s = ''.join(reversed(s))
print(reversed_s)  # Output: olleh

• There is a character code table ASCII that give each character a code