Some apps:

Basics: duolingo: https://www.duolingo.com/

Vocab: memrise:  https://www.memrise.com/

Sentences: language zen: https://www.languagezen.com/

Complete course, first lessons free, then payed: Babbel: https://babbel.com/

App to learn some basic conversations: Spanish injection: https://play.google.com/store/apps/details?id=com.immersia.inj.spanish.gplay&hl=en

App to study your conjugations: regular verbs: http://learningspanish.thisiscool.com/verbs/regularverbs.php
Irregular verbs: http://learningspanish.thisiscool.com/verbs/irregularverbs.php

Podcasts are also perfect for improving your Spanish.
A good one is: Hoy Hablamos
https://hoyhablamos.com/

The youtube show "Learn Spanish with Extra" is perfect for beginners.
https://www.youtube.com/watch?v=mcwp8_dhgCU&t=4s

¡Hola, Momoko!:

There are lots of postcasts, websites and social media in Spanish.

Anyway, if would be perfect if you can give us an idea of your interests, hobbies and goals that you have. Please, do not hesitate to contact me if you want to talk about your preferences in Spanish. I will be more than happy to help you! Trial lessons are available from now.

¡Hasta pronto!

https://www.edx.org/course/basic-spanish-1-getting-started

For mobile: 

https://play.google.com/store/apps/details?id=com.duolingo&hl=en

All levels: Notes in Spanish Podcast, News in Slow Spanish

Advanced: Radio Ambulante

Ideas: switch your phone language setting to Spanish (also works for facebook, etc)