The stock market is off to a solid start of 2024, with the S&P 500 (SNPINDEX: ^GSPC) index gaining more than 5% yea to date. Software giants are leading the charge thanks to the continued boom in artificial intelligence (AI) tools. But not every big winner is a household name, and some of the best buy-and-hold investments in today's tech sector are not so familiar. Three Motley Fool contributors with deep tech expertise sat down to share their best-kept secrets in the current market. Read on to see why they ...