meaning of Solr query

I am a newbie to solr and i am trying to understand the different way of querying. I saw a code example as below:

'some search text'::type:value1:type:value2

Can anybody help me understand what the above string does?

I know if it is only type:value1 searches the field type with the value value1

Another question as how can I search a value in multiple fields? basically I want to do OR on fields.

Eg:type:value1 OR name:value1

Any link to the beginners tutorial or help is greatly appreciated.