Jim Cramer's Real Money column on Tuesday, Dec. 11, broke down why the founder of TheStreet dislikes tech ETFs.

"To understand the potential basis for a tech rally, we have to understand why we had a tech wreck to begin with. First, we had the collapse of Apple via order cutbacks of virtually all of its suppliers, and there is no denying that sales are weaker, perhaps because of issues with China, perhaps because the company hit a price retaining wall, perhaps because of worldwide slowing," Cramer wrote.

"But it wasn't just Apple that caused the problem. We too often underestimate the power of "other leaders" to color the tape. The two most obvious ones? Advanced Micro Devices (AMD) and Nvidia (NVDA)," he continued. "Both of these chip companies are remarkable, Nvidia because of its incredible technological edge and AMD because of its grit and its comeback with faster, better and cheaper products for personal computers and the data center. Both cratered."

Cramer digs further into his reasoning for wanting investors to focus on single stocks instead of ETF's.

He also answered a question from Adam, who emailed in asking whether or not he should include a Total Market ETF or a S&P 500 ETF as a "core foundation" in his portfolio? Adam gave examples such as iShares Core S&P Total U.S. Stock Market ETF   (ITOT) and SPDR S&P 500 ETF  (SPY) . 

Cramer said that he likes total market ETF's, but that he warns investors to stay away from--for example--FANG ETFs.

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