2 important lessons I’ve learned after buying into the crashing Cineworld share price Enter Your Email Address Image source: Getty Images. 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. Royston Wild | Wednesday, 19th August, 2020 | More on: CINE 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. Click here to claim your free copy of this special investing report now! Royston Wild owns shares of Cineworld Group. 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. Our 6 ‘Best Buys Now’ Shares See all posts by Royston Wild Simply click below to discover how you can take advantage of this. 5 Stocks For Trying To Build Wealth After 50 It’s no exaggeration to say that Cineworld Group (LSE: CINE) has been a nightmare buy for me. This UK share’s lost a whopping 85% of its value since I bought in almost two years ago. The Cineworld share price could have further to fall if a second Covid-19 waves crushes the FTSE 250 firm’s plans to reopen its cinema network, too.It’s no use punching the wall when your shares collapse in value. Extreme volatility is part and parcel of stock investing. What is important is to learn why your share buys didn’t work out so as to help you avoid making similar mistakes. Here are some nuggets of wisdom that I’ve taken from the crashing Cineworld share price: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…Beware of debt-laden balance sheetsCineworld had a lot of debt on its balance sheet when I bought the shares in October 2018. The acquisition of US cinema chain Regal Entertainment to create the world’s second-largest screen operator saw its net debt pile balloon to around $3.7bn.Despite this, I was confident that the company’s management team would have a firm grip on the problem. I was also excited about its expansion into the world’s biggest cinema market in North America. The Cineworld share price traded on a forward price-to-earnings (P/E) ratio of around 14 times at that time, too, suggesting that the debt problem was reflected by that undemanding multiple.The closure of its cinemas due to Covid-19 wasn’t something that I could have predicted when I bought in two autumns ago. But it’s a development that’s left management’s debt-cutting plans in tatters and made me think twice before buying shares with big debts again.Diversification offsets the sinking Cineworld share priceCineworld warned back in March that it could struggle to continue as “a going concern” because of its high debt pile. It’s reopening its cinemas again, but as Covid-19 infection rates spike across its major territories, the business isn’t out of the woods yet. The Cineworld share price could still theoretically go to zero.The FTSE 250 firm’s travails illustrate perfectly the importance of creating a diversified stocks portfolio. Sure, the Cineworld share price has dropped by almost nine-tenths since I bought in. But this particular stock is just one of more than a dozen in my Stocks & Shares ISA. And my shares cover a broad range of industries so as to protect me from sector-specific problems like the mass theatre closures that have damaged Cineworld. This is why I haven’t lost any sleep over the chain’s sinking share price.Is now the time to buy?Cineworld, as I say has been a disaster for me. But could it be an attractive contrarian buy for investors right now? It remains laden with problems as, even if a new wave of Covid-19 doesn’t cause it to reclose its cinemas, social distancing rules will damage its ability to fill its theatres to the rafters.On the other hand, though, right now the Cineworld share price trades on a rock-bottom P/E ratio of just 3 times. If it can overcome its current problems then it will be in the box seat to ride the booming global box office and possibly deliver exceptional shareholder returns. At current prices it could well be worth a speculative buy. Markets around the world are reeling from the coronavirus pandemic…And with so many great companies trading at what look to be ‘discount-bin’ prices, now could be the time for savvy investors to snap up some potential bargains.But whether you’re a newbie investor or a seasoned pro, deciding which stocks to add to your shopping list can be daunting prospect during such unprecedented times.Fortunately, The Motley Fool is here to help: our UK Chief Investment Officer and his analyst team have short-listed five companies that they believe STILL boast significant long-term growth prospects despite the global lock-down…You see, here at The Motley Fool we don’t believe “over-trading” is the right path to financial freedom in retirement; instead, we advocate buying and holding (for AT LEAST three to five years) 15 or more quality companies, with shareholder-focused management teams at the helm.That’s why we’re sharing the names of all five of these companies in a special investing report that you can download today for FREE. If you’re 50 or over, we believe these stocks could be a great fit for any well-diversified portfolio, and that you can consider building a position in all five right away.