Pick Language to Auto Translate:
AR |
BG |
CA |
CS |
DA |
DE |
EL |
ES |
FI |
FR |
HI |
HR |
ID |
IT |
IW |
JA |
KO |
LT |
LV |
NL |
NO |
PL |
PT |
RO |
RU |
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SV |
TL |
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ZH-TW
This is a complex question。
Let start with something simple, Drupal 9.0 branch is identical to 8.9.x except for the Deprecated code removed。
Secondly, you need to go through your list of modules to see if it has version for Drupal 9.
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