Look for low "expense ratios", which both save you money on fees and indicate a passive index fund. Passive funds don't participate in the market competition where half lose and half win. And since competing also involves spending money, passive funds actually beat most of the market (the S&P 500 beats ~80% of active funds, for example).
The following is a "global" fund that includes both U.S. and international equities:
Blackrock MSCI ACWI EX CL BMSIT
So you could pour all of your equity allocation into "one fund", knowing this one fund covers stocks from all over the world (Apple, Toyota, Alibaba, etc). The expense ratio of 0.11% (per year) is in the low range.
The problem is if you try to split U.S. and international, the other international options don't look ideal. For example, Dodge & Cox International charges 0.65% in annual fees, which is higher than you'd want.