Stuck on Amp training Mission with not being able to select the right weapon amp

This is a known issue.

Check this thread on the official Insomniac forums for info and a workaround

www.insomniacgames.com/.../showthread.php

Enchanting & Smithing are, in my opinion, the 2 most important skills regardless of playstyle. Smithing for the simple fact that it is, by far, the easiest to max level & Enchanting because being able to put 2 enchantments on weapons & armor is really beneficial
(which you can do with the Enchanting 100 perk).



Also, train skills you don't use. You may never use Illusion magic, but training it up to a high level will help you rank up overall...

The training (save the president and the shooting range) are available by selecting

Campaign>Mission Select

Then pick the first mission (furthest left)

You have to play through the story part of the mission to get to the training sections but it is always available.

The tanker mission(s). Disappearing cab. Truck getting stuck & immovable on environment.

SO has a lot of content. Between all the missions, side missions, hundreds of collectables, weapons, tons of weapon upgrades, amps, hero amps, challenges all over the map, chaos squad, 2 dlc packs and a big city to grind through. It has a ton of content.
I put in well over 70 hours.