reflexive Verben
when using some of the"reflexive Verben".What is usually the difference between using the verb itself with/without "Sich"

For EX:
*sich entscheiden
-entscheiden

*sich brechen
-brechen

Question

reflexive Verben
when using some  of the"reflexive Verben".What is usually the difference between using the verb itself with/without "Sich"

For EX:
*sich entscheiden
-entscheiden

*sich brechen 
-brechen

Answer

In some cases you can leave it out and substitute it with an object.
Er hat sich gewaschen.
Er hat seine Puppe gewaschen. 
Sometimes the meaning changes.
Ich ziehe mich um. I change my clothes.
Ich ziehe um. I move to another flat.
Sometimes you can't leave it out.
Ich interessiere mich fuer dein neues Auto.
Here a link in English: https://deutsch.lingolia.com/en/grammar/verbs/reflexive-verbs