Devipuram is the best. The free beginner's courses teach you how to approach spirituality in a practical way, and own it. You get mantra permissions. The first mantras come from Annapurnambaji, wife of Swami Amritananda, live, through Zoom.
Swami Amritananda was a genius, and he has a collection of valuable meditation techniques. They are for you. Many people now are taking so-called Sri Vidya, and paying for it. Then they are getting a piece here, a piece there, but never the whole picture.
From the free beginner's classes you will get so many advanced means for developing yourself, and working with the devata. I belong to some highly esoteric Sri Vidya groups because I just like to hear people talk about the Goddess. But most of these groups follow no path and the people are just as bewildered as the common ignorant, or more so because they are dazzled by the brilliance of teachers who have years of study of advanced esoterica. Yet those teachers cannot transmit the knowledge.
Swami Amrita didn't have that problem. His path is modelled on Parasurama's Kalpa Sutras. And includes all the necessary aspects of worship, without getting everybody hung up on esoterica, and without demanding payments.
Start with the Saraswati Vac pdf. Which gives a lovely Saraswati mantra, and the AliKali mantra. This gets one ready for Satchakra japa (japa on the chakra petals), done later.
Then apply for the beginner's course. Sometimes it takes a month or two for them to start. Right now Rama Amma one of Amrita's daughters is on tour through the USA and UK. Maybe Radha (another daughter) is still conducting the beginner's courses. But maybe she isn't. Thus maybe they wll be a couple months untl the next ones.
Nonetheless, you are given two pdfs with a number of practices: viraj Homam, Kundalini meditation, Saraswati Vac mantra, and more.
In beginning courses you will learn tarpanam, puja, satchakra japa, and how to work with the three base chakras andtheir deities. You will learn the short Devi shloka and also how to move the attention during japa, which is something no other guru I have heard of does. You will work with devata Mahaganapati, Bala Tripurasundari, and Chandi.
I hope you partake. Jai Gurus Amrita and Annapurnambaji