Excellent sources of guided mediations, talks, audios & more:
Insight Timer - lots of free meditations and courses, and paid content as well
Sounds True - paid meditations, audio content, online courses, some free podcasts
Hay House - paid books, audio, online courses, some free events
Tara Brach - free (or by donation) meditations and paid courses

Google "Meditations" or "Free Meditations" and there are a number of them available on YouTube and various websites
Google specific author's names and they often have free audios, videos and resources on their websites