For new and old investors, taking full advantage of the stock market and investing with confidence are common goals. Zacks Premium provides lots of different ways to do both.Featuring daily updates of the Zacks Rank and Zacks Industry Rank, full access to the Zacks #1 Rank List, Equity Research reports, and Premium stock screens, the research service can help you become a smarter, more self-assured investor.Zacks Premium includes access to the Zacks Style Scores as well.What are the Zacks Style Scores?Developed alongside the Zacks Rank, the Zacks Style Scores are a group of complementary indicators that help investors pick stocks with the best chances of beating the market over the next 30 days.Each stock is given an alphabetic rating of A, B, C, D or F based on their value, growth, and momentum qualities. With this system, an A is better than a B, a B is better than a C, and so on, meaning the better the score, the better chance the stock will outperform.The Style Scores are broken down into four categories:Value ScoreFor value investors, it's all about finding good stocks at good prices, and discovering which companies are trading under their true value before the broader market catches on. The Value Style Score utilizes ratios like P/E, PEG, Price/Sales, Price/Cash Flow, and a host of other multiples to help pick out the most attractive and discounted stocks.Growth ScoreGrowth investors, on the other hand, are more concerned with a company's financial strength and health, and its future outlook. The Growth Style Score examines things like projected and historic earnings, sales, and cash flow to find stocks that will experience sustainable growth over time.Momentum ScoreMomentum trading is all about taking advantage of upward or downward trends in a stock's price or earnings outlook, and these investors live by the saying "the trend is your friend." The Momentum Style Score can pinpoint good times to build a position in a stock, using factors like one-week price change and the monthly percentage change in earnings estimates.VGM ScoreIf you like to use all three kinds of investing, then the VGM Score is for you. It's a combination of all Style Scores, and is an important indicator to use with the Zacks Rank. The VGM Score rates each stock on their shared weighted styles, narrowing down the companies with the most attractive value, best growth forecast, and most promising momentum.How Style Scores Work with the Zacks RankA proprietary stock-rating model, the Zacks Rank utilizes the power of earnings estimate revisions, or changes to a company's earnings outlook, to help investors create a successful portfolio.#1 (Strong Buy) stocks have produced an unmatched +25.41% average annual return since 1988, which is more than double the S&P 500's performance over the same time frame. However, the Zacks Rank examines a ton of stocks, and there can be more than 200 companies with a Strong Buy rank, and another 600 with a #2 (Buy) rank, on any given day.With more than 800 top-rated stocks to choose from, it can certainly feel overwhelming to pick the ones that are right for you and your investing journey.That's where the Style Scores come in.To have the best chance of big returns, you'll want to always consider stocks with a Zacks Rank #1 or #2 that also have Style Scores of A or B, which will give you the highest probability of success. If you're looking at stocks with a #3 (Hold) rank, it's important they have Scores of A or B as well to ensure as much upside potential as possible.The direction of a stock's earnings estimate revisions should always be a key factor when choosing which stocks to buy, since the Scores were created to work together with the Zacks Rank.Here's an example: a stock with a #4 (Sell) or #5 (Strong Sell) rating, even one with Style Scores of A and B, still has a downward-trending earnings outlook, and a bigger chance its share price will decrease too.Thus, the more stocks you own with a #1 or #2 Rank and Scores of A or B, the better.Stock to Watch: United Rentals (URI)Headquartered in Stamford, CT, United Rentals, Inc. is the largest equipment rental company in the world, with an integrated network of 1,165 rental locations in United States, Canada and Europe. Moreover, it operates in 49 states and every Canadian province. The company offers 4,000 classes of equipment for rent at a total original equipment cost (“OEC”) of $13.8 billion. The company’s customer base includes construction and industrial companies, utilities, municipalities, government agencies, independent contractors and homeowners and other individuals that use equipment for projects that range from simple repairs to major renovations. The company’s principal products and services are equipment rental, sale of rental equipment, new equipment, contractor supplies, services and other.URI is a #2 (Buy) on the Zacks Rank, with a VGM Score of A.Momentum investors should take note of this Construction stock. URI has a Momentum Style Score of A, and shares are up 0.4% over the past four weeks.One analysts revised their earnings estimate upwards in the last 60 days for fiscal 2021. The Zacks Consensus Estimate has increased $0.05 to $21.89 per share. URI boasts an average earnings surprise of 12.7%.With a solid Zacks Rank and top-tier Momentum and VGM Style Scores, URI should be on investors' short list. Tech IPOs With Massive Profit Potential In the past few years, many popular platforms and like Uber and Airbnb finally made their way to the public markets. But the biggest paydays came from lesser-known names. For example, electric carmaker X Peng shot up +299.4% in just 2 months. Think of it this way… If you had put $5,000 into XPEV at its IPO in September 2020, you could have cashed out with $19,970 in November. With record amounts of cash flooding into IPOs and a record-setting stock market, this year’s lineup could be even more lucrative.See Zacks Hottest Tech IPOs Now >>Want the latest recommendations from Zacks Investment Research? Today, you can download 7 Best Stocks for the Next 30 Days. Click to get this free report United Rentals, Inc. (URI): Free Stock Analysis Report To read this article on Zacks.com click here.