Clear 100% silicone.
White glue will work for that.
The best glue for adhering plexiglass to metal is a clear acrylic adhesive specifically designed for bonding these materials together.
The best type of glue for bonding plexiglass together is a solvent-based adhesive specifically designed for acrylic materials.
school glue
by gluing with super glue or Elmer's glue
Depends what you are gluing.
Sewing buttons on is better than gluing them.
If gluing paper to paper, white glue is best.
Depends on what you are gluing to what, and what it will be exposed to- moisture, heat, etc. If you are gluing paper to paper you can use a thin mix of flour and water as a glue. Wait until it dries thoroughly.
When using acrylic glue for plexiglass projects, it is important to clean the surfaces thoroughly, apply the glue sparingly, and clamp the pieces together until the glue sets. It is also recommended to follow the manufacturer's instructions for the specific type of acrylic glue being used.
Epoxy is best for gluing glass to wood.
Either use a hot glue gun or some super glue.