As well and too are used to say also, and we usually put them at the end of the sentence.

Examples:

I like pizza as well.

I like pizza too.
(They mean the same)

Note: Too is more common in speaking. As well is more formal.

We use as well as to connect nouns or noun phrases. It means in addition to.

✅ Examples:

I speak Spanish as well as English.
She bought fruit as well as vegetables.

​We use also in the middle of the sentence, usually before the main verb.

Examples:
I also like apples.
They also play soccer on weekends.
If the verb is to be → also goes after to be She is also a teacher.