It's sometimes hard to probe a point on a PCB.
Manufacturers sell "consumable" solder-in solutions.
You can temporarily or permanently attach them to your design, and it makes probing easier and reliable.
I have a suggestion for a DIY solder-in solution that takes little effort and is cheap + reusable:
Solder the two wires to the desired component in the circuit.
Typically, you'll want to solder the black one to ground, the red one to the point of interest.
If you're careful, you can solder this in many times. If needed, cut away a little end of the wire and you are set for many future uses.
Insert the probe, without hook and crocodile wire attached.