I'm ready to buy everything but I don't know whats the difference between FDM and SLA
nope

i'm just praying it works w the portable
Don't pray, check and do it right. If you try to fudge this, you may as well take the money you were going to spend and burn it in the fireplace.
As for your question about printer types:
Fused
Deposition
Modelling (
FDM) refers to printers that fabricate objects by melting a line of plastic filament, like an Ender 3, Prusa Mk4, or Bambu X1/P1/A1. FDM prints are stronger, have many options for material properties, but take exponentially longer to print as volume increases and have visible layer lines. THis is usually the cheapest option and the easiest to iterate.
Stereo
Lithogr
Aphy (
SLA), or
Masked
Stereo
Lithogr
Aphy (
MSLA) refers to printers that use ultraviolet light to cure layers of liquid photosensitive resin in a vat to fabricate objects.
SLA prints are highly smooth and detailed with almost invisible layer lines, most of the prettiest portables you see on youtube/reddit are painted
SLA prints. The downside is that UV resin is quite brittle and cracks/scratches easily if dropped or twisted, and will warp if improperly cured. This is more expensive than
FDM, the extent of which depends on what kind of resin is used and what post-processing options are chosen.
You may also have heard of
Selective
Laser
Sintering (
SLS), which refers to printers that spray a fine layer of nylon particles and melt them with a laser to fabricate objects, or
Multi-
Jet
Fusion (
MJF), which refers to printers that spray a layer nylon particles and then selectively spray a chemical agent over the print and cure it with a UV light to fabricate objects. They produce objects that are more detailed than
FDM, less detailed than
SLA, but can be more durable than both.
SLS/MJF prints tend to have a slightly rough dry texture to them a bit like a Gamecube controller. This is usually the most expensive option, but customer satisfaction is very high.