Why is my new front wheel not spinning? Today my front wheel got flat. I took it for repair and when I went back home cycling it was very hard.  It felt so heavy and that was not normal for speed 4, when I changed down to speed 3, 2, 1 it was also spinning slowly and feeling so heavy. I stopped the bike and spun both wheels, the front new wheel was spinning very slowly; almost not moving and the back older wheel was spinning fine and fast, so I realised there was a problem with the new wheel. I would like to know what the technician did wrong?  How can it be fixed?

I want to know because when I go back to the bike shop I wish to be aware of what has happened so he doesn't fool me.
The most likely problem is that the brakes are rubbing.  If you pick up the front of the bike, hold your head near the brakes and spin the wheel you shouldn't hear any noise from the brakes.  If you do, then the brakes are rubbing and that's the first problem to be fixed.  To be honest, I'd guess that's 99% likely to be your problem.

If you have fenders, and the new tire is larger in size than the old one, then there may not be enough clearance for it; that can also be detected by listening for rubbing sounds.

If the brakes are fine and nothing else is rubbing, pop the wheel off the bike and try spinning the axle; if it doesn't spin freely then that means there's too much pressure on the bearings.  (Note this is really unlikely if the shop only changed the tire.)