First, read the English article below.

How competent is the management running the company? More importantly, how focused are they toward the company, customers, investors, and employees? In this age of rampant corporate greed, it's always a great idea to research the management of any company you're thinking of investing in. Newspaper and magazine articles are good places to get this information. This doesn't just mean that management has provided good financial results recently. Rather, look for indications of other important qualities like responsiveness, adaptability, capacity for innovation, and organizational ability. A good leader can successfully turn around a company that many consider to be a lost cause. Watch the news and financial reports for changes in management positions, especially CEOs. If you believe in the new CEO of a company, based on your research, you may choose to invest in that company. Here, you're essentially putting your faith in the person, not the company. Even a great company can be overvalued. Learn to interpret financial statements and pick stocks with fundamental analysis to find companies the market has overvalued. Know that these companies may be some of the most buzzed-about and invested in companies around, but they are still overvalued and may experience drastic declines in price once their day in the spotlight is over.   One way to determine if a stock is overpriced is to examine its price-earnings-ratio. The price to earnings ratio can usually be found in the company's stock summary on financial websites. Generally, PE ratios are between 20-25, but this varies by industry.  To evaluate a company's PE ratio, search online for the average PE ratio in the company's industry. If the P/E ratio is over the industry average, the company could be overpriced in view of its earnings. Undervalued stocks are those that are trading at a lower value than their financial information would indicate. These may be companies that have only started to do well recently. In these cases, the market has not yet caught up with... 

Now, please write a short abstract for it in Indonesian. Abstract:
Periksa kualitas manajemen perusahaan. Awasi perubahan dalam manajemen. Jauhi saham yang terlalu mahal (overvalue). Anda juga bisa mencari perusahaan dengan rasio harga terhadap nilai buku (price-to-book-value ratio) yang kurang dari 2.