When you start looking for help with a robot build, the first wall you hit is not technical. It is figuring out what kind of help you actually need. A one-off question about wiring a motor driver is not the same as wanting someone to review your whole chassis design, and treating them the same way wastes everyone's time.
Most hobbyists I talk to in the forum land somewhere between two extremes. On one side, they want a quick answer so they can get back to soldering. On the other, they have a project that has stalled for weeks and they need a proper second pair of eyes. The format you choose should match where you are in the build, not where you think you should be.
For a single stubborn problem, a short session works well. You bring your schematic, your code, and a clear description of what the robot does when you power it on. In thirty minutes we can usually trace the fault to a bad ground connection, a logic level mismatch, or a sensor that is fighting the ambient light in your workshop. The key is to prepare the details before we start, because vague descriptions lead to vague answers.
If your project is bigger, a longer engagement makes more sense. Maybe you are building a line follower from scratch and want someone to check your part list before you order, or you need help tuning a PID loop so the robot stops oscillating at every corner. In that case, a structured review of your build log and code gives you a plan you can follow over a few weekends, rather than a patch for one symptom.
There is also the middle ground, which I think gets overlooked. A short check-in after you have made progress can catch small mistakes before they become expensive ones. For example, a member recently shared photos of a chassis he had laser-cut from 3 mm acrylic. It looked clean, but the mounting holes for his motors were 2 mm too close together, which would have made the gearboxes bind. A quick look at the drawing before he cut the second plate saved him a full afternoon of rework.
The honest advice is this: do not pay for a full consultation when a focused question will do, and do not try to solve a systemic problem with a single quick answer. Look at what is blocking you, be honest about your own skill level, and pick the format that gives you the clearest path forward. If you are unsure which one that is, describe your situation and we can point you in the right direction.