How to add many axes with Matplotlib in Python

import matplotlib.pyplot as plt
import numpy as np

x = np.arange(1,10)
y = x ** 4

fig = plt.figure(figsize = (10,8), dpi=400)
axes1 = fig.add_axes([0,0,2,2])
axes1.plot(x,y, label = 'X vs X', color = 'green', marker = 'o', markersize = 10, markerfacecolor = 'red', linestyle ='-.')

axes1.set_xlim(0,8)
axes1.set_ylim(0,8000)
axes1.set_xlabel("X label")
axes1.set_ylabel("Y label")
axes1.set_title("String title")
axes1.legend()


a = np.arange(1,5)
b = a * 100

axes2 = fig.add_axes([0.3,0.3, 0.6,0.6])
axes2.plot(a,b, label = 'Label', color = 'blue')

axes2.set_xlim(1,2)
axes2.set_ylim(0,500)
axes2.set_xlabel("X label")
axes2.set_ylabel("Y label")
axes2.set_title("String title")
axes2.legend(loc = 'lower right') # locate the label
# axes2.legend(loc = (1.1,0.5)) # outside