"Do not be too confident" after Tuesday's big rally, Jim Cramer

CNBC's Jim Cramer told Wall Street on Tuesday that his second best day of the year was marked by two days of stock market panic. Investors have felt the optimism generated by trade with China and Mexico, and the market has grown.

"Yesterday, the exclusive oscillator that I am has reached the negative grade 5, signaling that the market had become too sold, that is why I told you that it was time to buy "said the host of" Mad Money ". "This is the real reason we were able to explode higher today following talks by foreign officials and the Federal Reserve – the market was like a coiled spring."

The Dow Jones Industrial Average added more than 512 points, the S & P 500 gained 2.14% and the Nasdaq Composite, 2.65%.

Cramer nevertheless warned viewers not to be too optimistic because the environment is still volatile. The animator worries that the market has a ridiculously short memory.

Officials in Washington, DC on Monday, "declared war" on Facebook, Alphabet and Apple for antitrust reasons, he said. Each of the tech giants saw its shares climb 1.5% to 3.7% during Tuesday's session, helping to maintain the Nasdaq, technology-heavy index, of around 194%. more points.

However, each of these shares fell by more than 11% last month.

"Suddenly the government got [religious] on antitrust, at least in the technology sector, and it's not great for these colossal companies, "said Cramer. As for Apple, [the] Justice [Department] comes after them for antitrust reasons "on the App Store, and" if trade negotiations with the Chinese do not resume, I think you can expect that Apple will be charged a 10% tariff on its products made in China. "

The tech rebound could continue Wednesday after Salesforce announced a "fantastic" quarter after Tuesday's close, Cramer said.

Outside of the tech sector, Tuesday's comments by Federal Reserve Chairman Jerome Powell helped banks and the global market recovery, Cramer said. Powell said the central bank would monitor the trade wars and "act appropriately to support the expansion."

Cramer noted that a number of badysts have recommended buying Uber shares, which stand at around $ 3 on the price of its IPO at $ 45.

Industrials rose, as interest rates showed that the economy could be in better shape than previously thought; the semiconductor industry has grown even though the group is slowing down; and Cramer's "Cloud Kings" group has also shown life, said Cramer.

"Today's day was a clbadic example of why you should always buy stocks when the market is upset," Cramer said. "Do not forget that good things can always happen, but do not be too confident, because bad things can happen too."

Disclosure: The Cramer Charitable Trust owns shares of Facebook, Alphabet, Salesforce.com and Apple.