Can the board be powered by a USB ISP programmer?

Question

Electronics

I started studying radio electronics. In the future I plan to study working with microcontrollers, so I bought a USB ISP programmer.
There is no regulated power supply yet, and it’s too expensive to power everything from batteries.
I tried to power my crafts from an old phone charger and from a USB ISP programmer via VCC and GND pins.
It turned out to be very convenient to power from the programmer - it is connected to the laptop via USB, and if you need something, you can easily peep on this very laptop. Another plus is that the programmer has a stable voltage of 3.3 or 5 volts - you can switch very quickly.
BUT! Is it safe for the programmer? For laptop? If not, then why?
Is a phone charger better?

Ps: I know that I am engaged in game, and I need to make an adjustable block as soon as possible, but still very interesting)

Answer 1

Power both the programmer and the controller from the active hub. In principle, if they connect to the power buses, then it’s normal

Answer 2

quite. if the board consumes less than the power supply of the stabilizer in usb isp.
if the power consumption is greater than the capacity of the power source, then you will get a lot of interesting and hard-to-catch glitches from voltage drops.
all stabilizers contain overload protection so that it will only burn out with a certain persistence or sheer stupidity.
in order not to engage in game, go around your friends and collect chargers from phones, each of them is a power supply unit, usually five volts and a power of 2-10 watts. for "playing with arduino" is enough.
then you buy from your uncle's cellars or a better bp and you will continue to grow.
for 3.3v buy a dozen LF33 for the price of a bottle of beer and solder a bundle of scarf with it.