Is the dumbbell you use one 50KG or two 50KG? If you use 50KG exercise, you can buy 80- 100 kg barbell pieces to practice first. If you add up the weight of your barbell bar in this way, the maximum weight can reach 230 kilograms. If you practice alone at home, it's almost the same without protection. It is best to buy 20KG two pieces, 15KG two pieces, 10KG two pieces, 5KG and 2.5KG two pieces, which is convenient for adjustment. It is better to go to the gym in the city to find some second-hand barbell pieces, which are much cheaper and comfortable to use, and it is not easy to buy rotten pieces wrapped in cement.

However, even if you can't go to the gym, you should find a partner with the same hobbies and protect each other. When you are heavy, you can also help with the belt in the last few times, otherwise you will be easily injured, not easy to achieve results, and you will not dare to rush the weight. If someone protects you, you can buy 200KG barbell pieces, which should be enough for you to practice for a long time.

Finally, I wish you better practice, pay attention to safety and don't get hurt.