Answer:
The most popular tools to build stuff are
Circular saw
Jigsaw
Table saw
Hammer
Screw gun
Mallet
Power drill
Screwdriver
drill
Etc..
Popular fun things to build are
Barstool
Table
Coffee table
Settlers of Catan
Wall storage shelves
Giant Jenga
You can build all of these with only 2 x 4s
Hope this helps have a great day! :)