Updating drivetrain on a mountain bike

I don't know if the problem is with the shifter or the derailleur, and I would really appreciate any help.

derailleur: shimano (that's all I know about it) shifter: a cheapy gradient thumb-knob shifter.

It's very important not to shift under pressure, as this will cause shift problems and damage your drivetrain.

If you're going uphill and you need a lower gear, keep pedaling, but ease off and pedal lightly while you shift.

The bike in question is a 1996 Marin bolinas ridge mountain bike I got at a garage sale years ago for .

When he tried to ride it, realized it doesn't shift gears at all. I jumped on the bike and almost immediately the wheel locked up. Read more This concerns a Shimano Tiagra 4600 2x shifter.

I've taken everything apart and put it back together again, but the wheel just won't move. There is travel remaining in the rear deraileur, but none in the shifter itself.

The bike has been working great so far, except for today.

After doing some research my bike uses a Shimano atlus bottom bracket Front derailleur. Read more I'm brand new to bike maintenance, and I have incredible difficulty getting my front derailleur to shift into the third (highest) gear, and then staying there.

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