Use heavy traces to provide both power and ground. Make sure that there is at least one electrolytic capacitor from each supply to ground. These traces and capacitors provide for the power requirements of the circuit from DC up to about 1 MHz. 45 degree angle turns are better than sharper ones, but they still add inductance. Radio frequency circuits use smooth curves whenever a trace must change direction.
Digital circuits use much of their current in high frequency pulses.
A good deal of it is in the range of 10 to 200 MHz. Here, inductance is much more important than resistance. The same trace has an inductance of at least 0.41 uHenry. Wider copper is helpful, but to halve the inductance you need 10 times the width. This is the reason that each IC power supply pin should have its own ceramic decoupling capacitor.