Warren Buffett, also known as the Oracle of Omaha for his investing ability, is making some interesting moves in the stock market.  Following Buffett's trades could be an easy way to secure a solid long-term portfolio.   According to CNBC, Buffett just made a major move in Chevron, which could go a long way:   Warren Buffett’s Berkshire Hathaway made a slew of changes to its equity portfolio last quarter.  Most notably the legendary investor ramped up his Chevron position by over 30%.  Berkshire owned over 38 million shares of Chevron at the end of 2021, about 33% more than what it held in the previous quarter, a regulatory filing revealed. Now the conglomerate’s bet on the energy name, worth about $4.5 billion, is the ninth biggest holding in its equity portfolio, according to InsiderScore.com analysis.  Buffett first bought Chevron at the end of 2020, which was largely viewed as a classic value play and a bet on the rebounding economy. The wager has paid off handsomely as the energy stock rallied 39% in 2021 and has gained another 16% year to date. Chevron also pays a 4.2% dividend.  The conglomerate also scooped up a timely 14.7 million shares of Activision Blizzard in the fourth quarter, before the video game agreed to an acquisition by Microsoft. Activision enjoyed a big rally this year, up 22.5%, after the announcement of the $68.7 billion all-cash deal.