Position sizing, keeping reserves and dry powder, spreading across stage, sector and geography, and what a portfolio is actually for.
Building the whole, not just picking pieces
Lessons
What a portfolio is actually for — A portfolio is not a collection of good ideas. It is an instrument built to deliver specific amounts of money at specific times, and almost every construction question becomes answerable once that is written down. (10 min)
Position sizing: how much of it to own — Sizing is where conviction gets converted into consequences, and it is the one variable in investing that is entirely within your control. Most people set it by feel and discover afterwards what they actually decided. (12 min)
Reserves and dry powder: the money you deliberately do not invest — Holding capital back looks like indecision and is frequently the most consequential decision in the portfolio. It is also not free, and the honest version of the argument prices both sides. (13 min)
Stage, sector and geography: where the spread is real — Portfolios are usually spread along the dimensions that are easy to label rather than the ones that determine whether two holdings fall together. This lesson is about telling the two apart. (11 min)
Cash is a decision, not the absence of one — Holding cash has a cost measured against what else the money could earn, and a value in optionality and sleep. Sizing it deliberately is part of portfolio construction rather than what is left over. (10 min)
One scheduled review beats constant tinkering — A yearly review checks allocation, concentration, costs and whether holdings still match their purpose. Doing it on a schedule, in writing, prevents both neglect and reacting to every market move. (9 min)