Behavioural research is clear: retail investors who check accounts frequently and trade more often underperform passive holders. Set-and-forget produces better results because it avoids panic selling and FOMO buying.
What 'no touching' means
Monthly automatic contributions to index funds. Don't check more than monthly. Don't sell during market downturns. Don't increase contributions during market highs. Boring is the strategy.
Most professional fund managers can't beat passive index funds long-term. Retail investors who try to time markets do worse. The least 'active' approach usually produces the best results.