Stock price when the opinion was issued
Basically the NASDAQ 100. Acts as a benchmark for a lot of people like himself. Extremely liquid. Trade, rather than invest. Top was around $550, and he thinks it will probably take out those highs before the end of the year.
Based on the look of the chart, he'd write calls against it with a strike of around $530-540. This way, you collect some premiums. If you don't want to get taken out, just keep rolling the strike price up.
US tech space is going to be the market that outperforms. He'd definitely put some new money there on any pullbacks of 5-7%. Soon to be in a lower growth, deflationary environment, where tech historically has performed better. Low cost ETF, can get in easily.