No dont read it. Nobody should read Das Kapital its a terrible book with very little pictures.
you dont need a marxist to tell you to save your money, you can talk to a financial planner or your priest about that. The use of wealth as a status symbol, like buying the latest fashion trends or getting unnecessary cosmetic surgery is different from wasting lots of money on your favorite chocolates. It's also much different than a rich man giving all of his land, wealth and his mansion that he owns to charity. It's also different than the inventor of penicillin Alexander Fleming giving away his patent for free when he couldve made millions. So yes your question "is consumerism or good or bad" requires a much more complicated answer than simply yes or no.
It's mainly based on your relation to the product, you would struggle to find something in your home, that was made in your home country. It's more difficult to ensure that everything you buy comes from some ethically produced source. Fair trade beans are good example, since you dont really know where the beans in your morning coffee came from either way, so something marked "fair trade" could be more exploitative. It also puts a band-aid over the real issue in that the coffee bean worldwide industry is using slave labor so rather than addressing that issue, instead we buy fair trade coffee for a few cents more. Which might help nobody in the end. It has problems like crowding out coffee growers from the poorest countries around the world who cannot afford the certification process. Even though they may be growing coffee the same way they have for centuries. The money may not go to any actual farmers and only go to wealthy landlords in central america and the farmers get paid nothing different, while the coffee growers from the poorest parts of the world no longer can compete because they are not labelled "fair trade".
There is also the question why there is no fair trade hamburgers, fair trade cigarettes, or fair trade gasoline. That "fair trade" is in fact more of a marketing technique used to pander to customers rather than actually accomplishing anything.
Lets say you have a cattle rancher's son who grows up watching cows being slaughtered, being skinned and watching their organs being harvested and because of this he decides to become a vegetarian. So he buys soybeans as a replacement for meat. Now instead of eating the cows living on his own property, slaughtered using his own hands, he instead buys soybeans from bolivia where they use child slave labor. He is now essentially enslaving a child to grow soybeans to avoid eating a cow. So because of this he decides to boycott soybeans until they stop using slave labor, so the company decides to install fair trade certifications that all their growers must pass, so now they raise the price of soybeans so they can stop using slave labor, but now all the other small sources of soybeans where they just cant afford the certifications are now crowded out of the market through no fault of their own. And the company that was using slave labor for years maybe pays a small increase in salary you now now they make $950 a year instead $900 and they pay for some safety equipment, but in exchange they no longer have as many competitors.