I would like to receive emails from you about product information and offers from The Fool and its business partners. Each of these emails will provide a link to unsubscribe from future emails. More information about how The Fool collects, stores, and handles personal data is available in its Privacy Statement. Image source: Aston Martin Our 6 ‘Best Buys Now’ Shares Simply click below to discover how you can take advantage of this. “This Stock Could Be Like Buying Amazon in 1997” I’m sure you’ll agree that’s quite the statement from Motley Fool Co-Founder Tom Gardner.But since our US analyst team first recommended shares in this unique tech stock back in 2016, the value has soared.What’s more, we firmly believe there’s still plenty of upside in its future. In fact, even throughout the current coronavirus crisis, its performance has been beating Wall St expectations.And right now, we’re giving you a chance to discover exactly what has got our analysts all fired up about this niche industry phenomenon, in our FREE special report, A Top US Share From The Motley Fool. See all posts by Jonathan Smith Warren Buffett is one of the most respected stock investors of several generations. His investments, held via Berkshire Hathaway, have led him to establish a net worth of almost $79bn. This has taken several decades to achieve, but with all the wisdom the 90-year-old has, we can learn a lot from him. Over the years Warren Buffett has given various interviews in which he gives snippets of advice. It’s some of these I want to focus on in helping me to make up my mind on whether the Aston Martin (LSE:AML) share price is good value for me.Understand what you’re buyingOne piece of advice is to “never invest in a business you cannot understand”. Buffett is modest in this regard, which is why he steers clear of some technology firms as he simply doesn’t fully understand their inner workings. For Aston Martin, I’m comfortable in saying that I do understand the business. The vast majority of revenue comes from producing sports cars. Even though the brand has worked on special projects in recent years (such as its creative collaboration with Triton Submarines), its core selling point is the cars that bear its name. 5G is here – and shares of this ‘sleeping giant’ could be a great way for you to potentially profit!According to one leading industry firm, the 5G boom could create a global industry worth US$12.3 TRILLION out of thin air…And if you click here we’ll show you something that could be key to unlocking 5G’s full potential…I also understand why the Aston Martin share price has fallen so much this year. The stock is down 57%, and trades around 75p, a far cry from the IPO level only a few years back. The main reason for this move is simply the fact that the business is losing money. The loss before tax for 2019 was £104.3m, and in Q2 of this year, the business needed heavy cash injections. Lawrence Stroll led a cash raise of £536m, and even this wasn’t enough. So although I get Warren Buffett’s advice, I remain unsure whether to invest.Warren Buffett on debtWarren Buffett is not a fan of debt. He’s quoted as saying that “you can’t borrow money at 18 or 20 percent and come out ahead”. Even though interest rates are much lower now, the same principle applies with debt-laden firms. Sadly, this is the case for Aston Martin. As of Q3, net debt stood at £869m. To put this into perspective, Q3 revenue was £124m. The net debt is very high, and I think this is one of the key concerns as to why the Aston Martin share price will struggle to perform well and “come out ahead” anytime soon.On balance, even though I understand what Aston does, I simply don’t think the business is currently performing well enough to warrant an investment. If it manages to reduce debt levels and turn a profit in the future, then this will change my opinion. Opportunities elsewhereSpeaking of his team, Warren Buffett has offered a final piece of good advice when he said that “we have never forgone an attractive purchase because of the macro or political environment”. For me, just because I’m staying away from the Aston Martin share price doesn’t mean I won’t invest in something. Brexit and Covid-19 have meant many businesses are struggling. Yet there are good value cheap stocks I’m considering buying, one of which I wrote about here. Renowned stock-picker Mark Rogers and his analyst team at The Motley Fool UK have named 6 shares that they believe UK investors should consider buying NOW.So if you’re looking for more stock ideas to try and best position your portfolio today, then it might be a good day for you. Because we’re offering a full 33% off your first year of membership to our flagship share-tipping service, backed by our ‘no quibbles’ 30-day subscription fee refund guarantee. jonathansmith1 has no position in any of the shares mentioned. The Motley Fool UK has no position in any of the shares mentioned. Views expressed on the companies mentioned in this article are those of the writer and therefore may differ from the official recommendations we make in our subscription services such as Share Advisor, Hidden Winners and Pro. Here at The Motley Fool we believe that considering a diverse range of insights makes us better investors. Jonathan Smith | Wednesday, 18th November, 2020 | More on: AML Warren Buffett advice: here’s how I’m applying it to the Aston Martin share price Enter Your Email Address Click here to claim your copy now — and we’ll tell you the name of this Top US Share… free of charge!