Example of a json in my database

request

  firestore()
        .collection(COLLECTION)
        .where("types", ">=", 'lDQJJnsq2osTIWCPLMRg')
        .get()
        .then(querySnapshot => {
            const arr = []
            querySnapshot.forEach(documentSnapshot => {
                const data = documentSnapshot.data()
                const el = {id: documentSnapshot.id, ...data}
                arr.push(el)
            })
            resolve(arr)
        })
        .catch(err => {
            console.log('err ', err )
            reject()
        });

1. Filer my collection if the property types containt a id specific I don't find how I add a condition 'where' in the mappage ('types') In my logic, If types containt my id ("lDQJJnsq2osTIWCPLMRg") return this object.

2. Maybe for mobile, it's better to make a call with pagination, I found the method 'startAt' can help for pagination. It's correct ?

I begin with react-native & firebase, so thanks for help.