How a bonus combines with your others

The word an effect uses tells you exactly how it stacks. Two bonuses of the same size can be worth very different amounts depending on which word they use.

increased
Adds to a shared pool with every other source of the same thing. Two increases of the same size add together.

reduced
The same shared pool, in the other direction.

adds
Adds a flat value to a base before percentages apply to it. Your increases then multiply the bigger base, so flat adds are worth stacking increases for.

more / less
Its own separate multiplier. It multiplies everything else instead of adding to it, which makes it worth far more than the same number of increased.

more often
Makes something happen at a higher rate rather than hit harder. Shorter intervals, more procs.