Levelling up advice ? (B42)

So I've got 100+ hours in and starting to survive a bit longer. I have never focussed on leveling up skills such as maintenance, electrical, carpentry etc.

What is the best way to do this for the skills ?

I am dismantling electrical items, not really doing anything for carpentry or much else.

I want to get into it as the crafting looks great and i will need electrical 3 for a generator and carpentry 3 for a rain collector.

Any advice would be appreciated.