Try the Commands Troubleshooting and Help page if you get stuff with server errors.
Minecraft Version Notes
1.14 Java minecraft give command
The Loom block was added and replaces the dye pattern. The new loom makes banners patterns a lot easier to apply. Illager banners were also added to world generation, see other banners for the pattern.
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Added: Chess pieces
Added: Cute Banners
Patch: Fixed alpha transparencies on banner previews.
Added: Banner Generator
Patch: Top Triangle Sawtooth was swapped with Top Triangle
Added: Letters A-Z
Added: Numbers 0-9
Added: 22 initial flags
Added: Banner converter