I'd encourage you to pay more attention to the S&P 500, which tracks the value of the 500 largest publicly traded companies in the U.S. The Dow Joes Industial Average (DJIA) is much more arbitrary, in two key ways. The DJIA holds just 30 stocks, compared to the 500+ in the S&P 500. And it tracks stock price, not overall value of a company.
Apple plans a stock split later this month. The S&P 500 will do nothing - Apple has the same weight before and after the 4:1 stock split. But in the DJIA, Apple's weight will drop by 4x, as it's stock price drops.
I actually wonder if certain companies are a bit too uncomfortable for DJIA to include... for example Berkshire Hathaway trades for about $300,000 per share. By it's current approach, if the DJIA included BRK.A shares, it would simply imitate Berkshire Hathaway's performance. And to a lesser degree, Amazon ($3183/sh) or Tesla ($1487/sh) might involve the same problem. In my view, stock price shouldn't decide weight in an index. And if you look at more modern indexes, they use a more stable value like market cap.