My mother used adverbs to modify the word familiarize. I mean fast. I can add them later. They are good for other words. We need to learn faster. You need to be careful when using fast when you say it. Fast is the most abrupt word in French. In most cases that don’t involve actual motion, Quickly is the better choice for adverb.

Whom can you recommend

1. as an application type by which you can familiarize yourself with new topics quickly?

2. I can quickly familiarize myself with new topics.

3. …I can familiarize myself quickly with new topics.

4. I can familiarize myself with new topics quickly.

What kind of flow has the second option (2), as nothing is interrupted and the flow is even? If the sentence was on its own, in a sentence. Now I’m right there next to you. This is the one I would use if it were.

The last one (4) may be the most meaningful as it tacks speed onto the ability statement without dominating or interrupting it. The words ‘quickly’ and ‘quickly’ are full of meaning, therefore they are very close. There is also a sense of finality when reading a word ‘quickly’. This is the one I will use in your sentence.